/src/postgres/src/backend/utils/adt/date.c

Source
/*-------------------------------------------------------------------------
 *
 * date.c
 *    implements DATE and TIME data types specified in SQL standard
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994-5, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    src/backend/utils/adt/date.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"

#include <ctype.h>
#include <limits.h>
#include <float.h>
#include <math.h>
#include <time.h>

#include "access/xact.h"
#include "catalog/pg_type.h"
#include "common/hashfn.h"
#include "common/int.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "nodes/supportnodes.h"
#include "parser/scansup.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/numeric.h"
#include "utils/skipsupport.h"
#include "utils/sortsupport.h"

/*
 * gcc's -ffast-math switch breaks routines that expect exact results from
 * expressions like timeval / SECS_PER_HOUR, where timeval is double.
 */
#ifdef __FAST_MATH__
#error -ffast-math is known to break this code
#endif


/* common code for timetypmodin and timetztypmodin */
static int32
anytime_typmodin(bool istz, ArrayType *ta)
{
  int32    *tl;
  int     n;

  tl = ArrayGetIntegerTypmods(ta, &n);

  /*
   * we're not too tense about good error message here because grammar
   * shouldn't allow wrong number of modifiers for TIME
   */
  if (n != 1)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("invalid type modifier")));

  return anytime_typmod_check(istz, tl[0]);
}

/* exported so parse_expr.c can use it */
int32
anytime_typmod_check(bool istz, int32 typmod)
{
  if (typmod < 0)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("TIME(%d)%s precision must not be negative",
            typmod, (istz ? " WITH TIME ZONE" : ""))));
  if (typmod > MAX_TIME_PRECISION)
  {
    ereport(WARNING,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("TIME(%d)%s precision reduced to maximum allowed, %d",
            typmod, (istz ? " WITH TIME ZONE" : ""),
            MAX_TIME_PRECISION)));
    typmod = MAX_TIME_PRECISION;
  }

  return typmod;
}

/* common code for timetypmodout and timetztypmodout */
static char *
anytime_typmodout(bool istz, int32 typmod)
{
  const char *tz = istz ? " with time zone" : " without time zone";

  if (typmod >= 0)
    return psprintf("(%d)%s", (int) typmod, tz);
  else
    return pstrdup(tz);
}


/*****************************************************************************
 *   Date ADT
 *****************************************************************************/


/* date_in()
 * Given date text string, convert to internal date format.
 */
Datum
date_in(PG_FUNCTION_ARGS)
{
  char     *str = PG_GETARG_CSTRING(0);
  Node     *escontext = fcinfo->context;
  DateADT   date;
  fsec_t    fsec;
  struct pg_tm tt,
         *tm = &tt;
  int     tzp;
  int     dtype;
  int     nf;
  int     dterr;
  char     *field[MAXDATEFIELDS];
  int     ftype[MAXDATEFIELDS];
  char    workbuf[MAXDATELEN + 1];
  DateTimeErrorExtra extra;

  dterr = ParseDateTime(str, workbuf, sizeof(workbuf),
              field, ftype, MAXDATEFIELDS, &nf);
  if (dterr == 0)
    dterr = DecodeDateTime(field, ftype, nf,
                 &dtype, tm, &fsec, &tzp, &extra);
  if (dterr != 0)
  {
    DateTimeParseError(dterr, &extra, str, "date", escontext);
    PG_RETURN_NULL();
  }

  switch (dtype)
  {
    case DTK_DATE:
      break;

    case DTK_EPOCH:
      GetEpochTime(tm);
      break;

    case DTK_LATE:
      DATE_NOEND(date);
      PG_RETURN_DATEADT(date);

    case DTK_EARLY:
      DATE_NOBEGIN(date);
      PG_RETURN_DATEADT(date);

    default:
      DateTimeParseError(DTERR_BAD_FORMAT, &extra, str, "date", escontext);
      PG_RETURN_NULL();
  }

  /* Prevent overflow in Julian-day routines */
  if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
    ereturn(escontext, (Datum) 0,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range: \"%s\"", str)));

  date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;

  /* Now check for just-out-of-range dates */
  if (!IS_VALID_DATE(date))
    ereturn(escontext, (Datum) 0,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range: \"%s\"", str)));

  PG_RETURN_DATEADT(date);
}

/* date_out()
 * Given internal format date, convert to text string.
 */
Datum
date_out(PG_FUNCTION_ARGS)
{
  DateADT   date = PG_GETARG_DATEADT(0);
  char     *result;
  struct pg_tm tt,
         *tm = &tt;
  char    buf[MAXDATELEN + 1];

  if (DATE_NOT_FINITE(date))
    EncodeSpecialDate(date, buf);
  else
  {
    j2date(date + POSTGRES_EPOCH_JDATE,
         &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
    EncodeDateOnly(tm, DateStyle, buf);
  }

  result = pstrdup(buf);
  PG_RETURN_CSTRING(result);
}

/*
 *    date_recv     - converts external binary format to date
 */
Datum
date_recv(PG_FUNCTION_ARGS)
{
  StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);
  DateADT   result;

  result = (DateADT) pq_getmsgint(buf, sizeof(DateADT));

  /* Limit to the same range that date_in() accepts. */
  if (DATE_NOT_FINITE(result))
     /* ok */ ;
  else if (!IS_VALID_DATE(result))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range")));

  PG_RETURN_DATEADT(result);
}

/*
 *    date_send     - converts date to binary format
 */
Datum
date_send(PG_FUNCTION_ARGS)
{
  DateADT   date = PG_GETARG_DATEADT(0);
  StringInfoData buf;

  pq_begintypsend(&buf);
  pq_sendint32(&buf, date);
  PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

/*
 *    make_date     - date constructor
 */
Datum
make_date(PG_FUNCTION_ARGS)
{
  struct pg_tm tm;
  DateADT   date;
  int     dterr;
  bool    bc = false;

  tm.tm_year = PG_GETARG_INT32(0);
  tm.tm_mon = PG_GETARG_INT32(1);
  tm.tm_mday = PG_GETARG_INT32(2);

  /* Handle negative years as BC */
  if (tm.tm_year < 0)
  {
    int     year = tm.tm_year;

    bc = true;
    if (pg_neg_s32_overflow(year, &year))
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
           errmsg("date field value out of range: %d-%02d-%02d",
              tm.tm_year, tm.tm_mon, tm.tm_mday)));
    tm.tm_year = year;
  }

  dterr = ValidateDate(DTK_DATE_M, false, false, bc, &tm);

  if (dterr != 0)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
         errmsg("date field value out of range: %d-%02d-%02d",
            tm.tm_year, tm.tm_mon, tm.tm_mday)));

  /* Prevent overflow in Julian-day routines */
  if (!IS_VALID_JULIAN(tm.tm_year, tm.tm_mon, tm.tm_mday))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range: %d-%02d-%02d",
            tm.tm_year, tm.tm_mon, tm.tm_mday)));

  date = date2j(tm.tm_year, tm.tm_mon, tm.tm_mday) - POSTGRES_EPOCH_JDATE;

  /* Now check for just-out-of-range dates */
  if (!IS_VALID_DATE(date))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range: %d-%02d-%02d",
            tm.tm_year, tm.tm_mon, tm.tm_mday)));

  PG_RETURN_DATEADT(date);
}

/*
 * Convert reserved date values to string.
 */
void
EncodeSpecialDate(DateADT dt, char *str)
{
  if (DATE_IS_NOBEGIN(dt))
    strcpy(str, EARLY);
  else if (DATE_IS_NOEND(dt))
    strcpy(str, LATE);
  else            /* shouldn't happen */
    elog(ERROR, "invalid argument for EncodeSpecialDate");
}


/*
 * GetSQLCurrentDate -- implements CURRENT_DATE
 */
DateADT
GetSQLCurrentDate(void)
{
  struct pg_tm tm;

  static int  cache_year = 0;
  static int  cache_mon = 0;
  static int  cache_mday = 0;
  static DateADT cache_date;

  GetCurrentDateTime(&tm);

  /*
   * date2j involves several integer divisions; moreover, unless our session
   * lives across local midnight, we don't really have to do it more than
   * once.  So it seems worth having a separate cache here.
   */
  if (tm.tm_year != cache_year ||
    tm.tm_mon != cache_mon ||
    tm.tm_mday != cache_mday)
  {
    cache_date = date2j(tm.tm_year, tm.tm_mon, tm.tm_mday) - POSTGRES_EPOCH_JDATE;
    cache_year = tm.tm_year;
    cache_mon = tm.tm_mon;
    cache_mday = tm.tm_mday;
  }

  return cache_date;
}

/*
 * GetSQLCurrentTime -- implements CURRENT_TIME, CURRENT_TIME(n)
 */
TimeTzADT *
GetSQLCurrentTime(int32 typmod)
{
  TimeTzADT  *result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  int     tz;

  GetCurrentTimeUsec(tm, &fsec, &tz);

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));
  tm2timetz(tm, fsec, tz, result);
  AdjustTimeForTypmod(&(result->time), typmod);
  return result;
}

/*
 * GetSQLLocalTime -- implements LOCALTIME, LOCALTIME(n)
 */
TimeADT
GetSQLLocalTime(int32 typmod)
{
  TimeADT   result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  int     tz;

  GetCurrentTimeUsec(tm, &fsec, &tz);

  tm2time(tm, fsec, &result);
  AdjustTimeForTypmod(&result, typmod);
  return result;
}


/*
 * Comparison functions for dates
 */

Datum
date_eq(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 == dateVal2);
}

Datum
date_ne(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 != dateVal2);
}

Datum
date_lt(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 < dateVal2);
}

Datum
date_le(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 <= dateVal2);
}

Datum
date_gt(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 > dateVal2);
}

Datum
date_ge(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(dateVal1 >= dateVal2);
}

Datum
date_cmp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  if (dateVal1 < dateVal2)
    PG_RETURN_INT32(-1);
  else if (dateVal1 > dateVal2)
    PG_RETURN_INT32(1);
  PG_RETURN_INT32(0);
}

Datum
date_sortsupport(PG_FUNCTION_ARGS)
{
  SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);

  ssup->comparator = ssup_datum_int32_cmp;
  PG_RETURN_VOID();
}

static Datum
date_decrement(Relation rel, Datum existing, bool *underflow)
{
  DateADT   dexisting = DatumGetDateADT(existing);

  if (dexisting == DATEVAL_NOBEGIN)
  {
    /* return value is undefined */
    *underflow = true;
    return (Datum) 0;
  }

  *underflow = false;
  return DateADTGetDatum(dexisting - 1);
}

static Datum
date_increment(Relation rel, Datum existing, bool *overflow)
{
  DateADT   dexisting = DatumGetDateADT(existing);

  if (dexisting == DATEVAL_NOEND)
  {
    /* return value is undefined */
    *overflow = true;
    return (Datum) 0;
  }

  *overflow = false;
  return DateADTGetDatum(dexisting + 1);
}

Datum
date_skipsupport(PG_FUNCTION_ARGS)
{
  SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);

  sksup->decrement = date_decrement;
  sksup->increment = date_increment;
  sksup->low_elem = DateADTGetDatum(DATEVAL_NOBEGIN);
  sksup->high_elem = DateADTGetDatum(DATEVAL_NOEND);

  PG_RETURN_VOID();
}

Datum
hashdate(PG_FUNCTION_ARGS)
{
  return hash_uint32(PG_GETARG_DATEADT(0));
}

Datum
hashdateextended(PG_FUNCTION_ARGS)
{
  return hash_uint32_extended(PG_GETARG_DATEADT(0), PG_GETARG_INT64(1));
}

Datum
date_finite(PG_FUNCTION_ARGS)
{
  DateADT   date = PG_GETARG_DATEADT(0);

  PG_RETURN_BOOL(!DATE_NOT_FINITE(date));
}

Datum
date_larger(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_DATEADT((dateVal1 > dateVal2) ? dateVal1 : dateVal2);
}

Datum
date_smaller(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  PG_RETURN_DATEADT((dateVal1 < dateVal2) ? dateVal1 : dateVal2);
}

/* Compute difference between two dates in days.
 */
Datum
date_mi(PG_FUNCTION_ARGS)
{
  DateADT   dateVal1 = PG_GETARG_DATEADT(0);
  DateADT   dateVal2 = PG_GETARG_DATEADT(1);

  if (DATE_NOT_FINITE(dateVal1) || DATE_NOT_FINITE(dateVal2))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot subtract infinite dates")));

  PG_RETURN_INT32((int32) (dateVal1 - dateVal2));
}

/* Add a number of days to a date, giving a new date.
 * Must handle both positive and negative numbers of days.
 */
Datum
date_pli(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  int32   days = PG_GETARG_INT32(1);
  DateADT   result;

  if (DATE_NOT_FINITE(dateVal))
    PG_RETURN_DATEADT(dateVal); /* can't change infinity */

  result = dateVal + days;

  /* Check for integer overflow and out-of-allowed-range */
  if ((days >= 0 ? (result < dateVal) : (result > dateVal)) ||
    !IS_VALID_DATE(result))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range")));

  PG_RETURN_DATEADT(result);
}

/* Subtract a number of days from a date, giving a new date.
 */
Datum
date_mii(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  int32   days = PG_GETARG_INT32(1);
  DateADT   result;

  if (DATE_NOT_FINITE(dateVal))
    PG_RETURN_DATEADT(dateVal); /* can't change infinity */

  result = dateVal - days;

  /* Check for integer overflow and out-of-allowed-range */
  if ((days >= 0 ? (result > dateVal) : (result < dateVal)) ||
    !IS_VALID_DATE(result))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("date out of range")));

  PG_RETURN_DATEADT(result);
}


/*
 * Promote date to timestamp.
 *
 * On successful conversion, *overflow is set to zero if it's not NULL.
 *
 * If the date is finite but out of the valid range for timestamp, then:
 * if overflow is NULL, we throw an out-of-range error.
 * if overflow is not NULL, we store +1 or -1 there to indicate the sign
 * of the overflow, and return the appropriate timestamp infinity.
 *
 * Note: *overflow = -1 is actually not possible currently, since both
 * datatypes have the same lower bound, Julian day zero.
 */
Timestamp
date2timestamp_opt_overflow(DateADT dateVal, int *overflow)
{
  Timestamp result;

  if (overflow)
    *overflow = 0;

  if (DATE_IS_NOBEGIN(dateVal))
    TIMESTAMP_NOBEGIN(result);
  else if (DATE_IS_NOEND(dateVal))
    TIMESTAMP_NOEND(result);
  else
  {
    /*
     * Since dates have the same minimum values as timestamps, only upper
     * boundary need be checked for overflow.
     */
    if (dateVal >= (TIMESTAMP_END_JULIAN - POSTGRES_EPOCH_JDATE))
    {
      if (overflow)
      {
        *overflow = 1;
        TIMESTAMP_NOEND(result);
        return result;
      }
      else
      {
        ereport(ERROR,
            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
             errmsg("date out of range for timestamp")));
      }
    }

    /* date is days since 2000, timestamp is microseconds since same... */
    result = dateVal * USECS_PER_DAY;
  }

  return result;
}

/*
 * Promote date to timestamp, throwing error for overflow.
 */
static TimestampTz
date2timestamp(DateADT dateVal)
{
  return date2timestamp_opt_overflow(dateVal, NULL);
}

/*
 * Promote date to timestamp with time zone.
 *
 * On successful conversion, *overflow is set to zero if it's not NULL.
 *
 * If the date is finite but out of the valid range for timestamptz, then:
 * if overflow is NULL, we throw an out-of-range error.
 * if overflow is not NULL, we store +1 or -1 there to indicate the sign
 * of the overflow, and return the appropriate timestamptz infinity.
 */
TimestampTz
date2timestamptz_opt_overflow(DateADT dateVal, int *overflow)
{
  TimestampTz result;
  struct pg_tm tt,
         *tm = &tt;
  int     tz;

  if (overflow)
    *overflow = 0;

  if (DATE_IS_NOBEGIN(dateVal))
    TIMESTAMP_NOBEGIN(result);
  else if (DATE_IS_NOEND(dateVal))
    TIMESTAMP_NOEND(result);
  else
  {
    /*
     * Since dates have the same minimum values as timestamps, only upper
     * boundary need be checked for overflow.
     */
    if (dateVal >= (TIMESTAMP_END_JULIAN - POSTGRES_EPOCH_JDATE))
    {
      if (overflow)
      {
        *overflow = 1;
        TIMESTAMP_NOEND(result);
        return result;
      }
      else
      {
        ereport(ERROR,
            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
             errmsg("date out of range for timestamp")));
      }
    }

    j2date(dateVal + POSTGRES_EPOCH_JDATE,
         &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
    tm->tm_hour = 0;
    tm->tm_min = 0;
    tm->tm_sec = 0;
    tz = DetermineTimeZoneOffset(tm, session_timezone);

    result = dateVal * USECS_PER_DAY + tz * USECS_PER_SEC;

    /*
     * Since it is possible to go beyond allowed timestamptz range because
     * of time zone, check for allowed timestamp range after adding tz.
     */
    if (!IS_VALID_TIMESTAMP(result))
    {
      if (overflow)
      {
        if (result < MIN_TIMESTAMP)
        {
          *overflow = -1;
          TIMESTAMP_NOBEGIN(result);
        }
        else
        {
          *overflow = 1;
          TIMESTAMP_NOEND(result);
        }
      }
      else
      {
        ereport(ERROR,
            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
             errmsg("date out of range for timestamp")));
      }
    }
  }

  return result;
}

/*
 * Promote date to timestamptz, throwing error for overflow.
 */
static TimestampTz
date2timestamptz(DateADT dateVal)
{
  return date2timestamptz_opt_overflow(dateVal, NULL);
}

/*
 * date2timestamp_no_overflow
 *
 * This is chartered to produce a double value that is numerically
 * equivalent to the corresponding Timestamp value, if the date is in the
 * valid range of Timestamps, but in any case not throw an overflow error.
 * We can do this since the numerical range of double is greater than
 * that of non-erroneous timestamps.  The results are currently only
 * used for statistical estimation purposes.
 */
double
date2timestamp_no_overflow(DateADT dateVal)
{
  double    result;

  if (DATE_IS_NOBEGIN(dateVal))
    result = -DBL_MAX;
  else if (DATE_IS_NOEND(dateVal))
    result = DBL_MAX;
  else
  {
    /* date is days since 2000, timestamp is microseconds since same... */
    result = dateVal * (double) USECS_PER_DAY;
  }

  return result;
}


/*
 * Crosstype comparison functions for dates
 */

int32
date_cmp_timestamp_internal(DateADT dateVal, Timestamp dt2)
{
  Timestamp dt1;
  int     overflow;

  dt1 = date2timestamp_opt_overflow(dateVal, &overflow);
  if (overflow > 0)
  {
    /* dt1 is larger than any finite timestamp, but less than infinity */
    return TIMESTAMP_IS_NOEND(dt2) ? -1 : +1;
  }
  Assert(overflow == 0);    /* -1 case cannot occur */

  return timestamp_cmp_internal(dt1, dt2);
}

Datum
date_eq_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) == 0);
}

Datum
date_ne_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) != 0);
}

Datum
date_lt_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) < 0);
}

Datum
date_gt_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) > 0);
}

Datum
date_le_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) <= 0);
}

Datum
date_ge_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt2) >= 0);
}

Datum
date_cmp_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp dt2 = PG_GETARG_TIMESTAMP(1);

  PG_RETURN_INT32(date_cmp_timestamp_internal(dateVal, dt2));
}

int32
date_cmp_timestamptz_internal(DateADT dateVal, TimestampTz dt2)
{
  TimestampTz dt1;
  int     overflow;

  dt1 = date2timestamptz_opt_overflow(dateVal, &overflow);
  if (overflow > 0)
  {
    /* dt1 is larger than any finite timestamp, but less than infinity */
    return TIMESTAMP_IS_NOEND(dt2) ? -1 : +1;
  }
  if (overflow < 0)
  {
    /* dt1 is less than any finite timestamp, but more than -infinity */
    return TIMESTAMP_IS_NOBEGIN(dt2) ? +1 : -1;
  }

  return timestamptz_cmp_internal(dt1, dt2);
}

Datum
date_eq_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) == 0);
}

Datum
date_ne_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) != 0);
}

Datum
date_lt_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) < 0);
}

Datum
date_gt_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) > 0);
}

Datum
date_le_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) <= 0);
}

Datum
date_ge_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt2) >= 0);
}

Datum
date_cmp_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz dt2 = PG_GETARG_TIMESTAMPTZ(1);

  PG_RETURN_INT32(date_cmp_timestamptz_internal(dateVal, dt2));
}

Datum
timestamp_eq_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) == 0);
}

Datum
timestamp_ne_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) != 0);
}

Datum
timestamp_lt_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) > 0);
}

Datum
timestamp_gt_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) < 0);
}

Datum
timestamp_le_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) >= 0);
}

Datum
timestamp_ge_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamp_internal(dateVal, dt1) <= 0);
}

Datum
timestamp_cmp_date(PG_FUNCTION_ARGS)
{
  Timestamp dt1 = PG_GETARG_TIMESTAMP(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_INT32(-date_cmp_timestamp_internal(dateVal, dt1));
}

Datum
timestamptz_eq_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) == 0);
}

Datum
timestamptz_ne_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) != 0);
}

Datum
timestamptz_lt_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) > 0);
}

Datum
timestamptz_gt_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) < 0);
}

Datum
timestamptz_le_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) >= 0);
}

Datum
timestamptz_ge_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_BOOL(date_cmp_timestamptz_internal(dateVal, dt1) <= 0);
}

Datum
timestamptz_cmp_date(PG_FUNCTION_ARGS)
{
  TimestampTz dt1 = PG_GETARG_TIMESTAMPTZ(0);
  DateADT   dateVal = PG_GETARG_DATEADT(1);

  PG_RETURN_INT32(-date_cmp_timestamptz_internal(dateVal, dt1));
}

/*
 * in_range support function for date.
 *
 * We implement this by promoting the dates to timestamp (without time zone)
 * and then using the timestamp-and-interval in_range function.
 */
Datum
in_range_date_interval(PG_FUNCTION_ARGS)
{
  DateADT   val = PG_GETARG_DATEADT(0);
  DateADT   base = PG_GETARG_DATEADT(1);
  Interval   *offset = PG_GETARG_INTERVAL_P(2);
  bool    sub = PG_GETARG_BOOL(3);
  bool    less = PG_GETARG_BOOL(4);
  Timestamp valStamp;
  Timestamp baseStamp;

  /* XXX we could support out-of-range cases here, perhaps */
  valStamp = date2timestamp(val);
  baseStamp = date2timestamp(base);

  return DirectFunctionCall5(in_range_timestamp_interval,
                 TimestampGetDatum(valStamp),
                 TimestampGetDatum(baseStamp),
                 IntervalPGetDatum(offset),
                 BoolGetDatum(sub),
                 BoolGetDatum(less));
}


/* extract_date()
 * Extract specified field from date type.
 */
Datum
extract_date(PG_FUNCTION_ARGS)
{
  text     *units = PG_GETARG_TEXT_PP(0);
  DateADT   date = PG_GETARG_DATEADT(1);
  int64   intresult;
  int     type,
        val;
  char     *lowunits;
  int     year,
        mon,
        mday;

  lowunits = downcase_truncate_identifier(VARDATA_ANY(units),
                      VARSIZE_ANY_EXHDR(units),
                      false);

  type = DecodeUnits(0, lowunits, &val);
  if (type == UNKNOWN_FIELD)
    type = DecodeSpecial(0, lowunits, &val);

  if (DATE_NOT_FINITE(date) && (type == UNITS || type == RESERV))
  {
    switch (val)
    {
        /* Oscillating units */
      case DTK_DAY:
      case DTK_MONTH:
      case DTK_QUARTER:
      case DTK_WEEK:
      case DTK_DOW:
      case DTK_ISODOW:
      case DTK_DOY:
        PG_RETURN_NULL();
        break;

        /* Monotonically-increasing units */
      case DTK_YEAR:
      case DTK_DECADE:
      case DTK_CENTURY:
      case DTK_MILLENNIUM:
      case DTK_JULIAN:
      case DTK_ISOYEAR:
      case DTK_EPOCH:
        if (DATE_IS_NOBEGIN(date))
          PG_RETURN_NUMERIC(DatumGetNumeric(DirectFunctionCall3(numeric_in,
                                      CStringGetDatum("-Infinity"),
                                      ObjectIdGetDatum(InvalidOid),
                                      Int32GetDatum(-1))));
        else
          PG_RETURN_NUMERIC(DatumGetNumeric(DirectFunctionCall3(numeric_in,
                                      CStringGetDatum("Infinity"),
                                      ObjectIdGetDatum(InvalidOid),
                                      Int32GetDatum(-1))));
      default:
        ereport(ERROR,
            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
             errmsg("unit \"%s\" not supported for type %s",
                lowunits, format_type_be(DATEOID))));
    }
  }
  else if (type == UNITS)
  {
    j2date(date + POSTGRES_EPOCH_JDATE, &year, &mon, &mday);

    switch (val)
    {
      case DTK_DAY:
        intresult = mday;
        break;

      case DTK_MONTH:
        intresult = mon;
        break;

      case DTK_QUARTER:
        intresult = (mon - 1) / 3 + 1;
        break;

      case DTK_WEEK:
        intresult = date2isoweek(year, mon, mday);
        break;

      case DTK_YEAR:
        if (year > 0)
          intresult = year;
        else
          /* there is no year 0, just 1 BC and 1 AD */
          intresult = year - 1;
        break;

      case DTK_DECADE:
        /* see comments in timestamp_part */
        if (year >= 0)
          intresult = year / 10;
        else
          intresult = -((8 - (year - 1)) / 10);
        break;

      case DTK_CENTURY:
        /* see comments in timestamp_part */
        if (year > 0)
          intresult = (year + 99) / 100;
        else
          intresult = -((99 - (year - 1)) / 100);
        break;

      case DTK_MILLENNIUM:
        /* see comments in timestamp_part */
        if (year > 0)
          intresult = (year + 999) / 1000;
        else
          intresult = -((999 - (year - 1)) / 1000);
        break;

      case DTK_JULIAN:
        intresult = date + POSTGRES_EPOCH_JDATE;
        break;

      case DTK_ISOYEAR:
        intresult = date2isoyear(year, mon, mday);
        /* Adjust BC years */
        if (intresult <= 0)
          intresult -= 1;
        break;

      case DTK_DOW:
      case DTK_ISODOW:
        intresult = j2day(date + POSTGRES_EPOCH_JDATE);
        if (val == DTK_ISODOW && intresult == 0)
          intresult = 7;
        break;

      case DTK_DOY:
        intresult = date2j(year, mon, mday) - date2j(year, 1, 1) + 1;
        break;

      default:
        ereport(ERROR,
            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
             errmsg("unit \"%s\" not supported for type %s",
                lowunits, format_type_be(DATEOID))));
        intresult = 0;
    }
  }
  else if (type == RESERV)
  {
    switch (val)
    {
      case DTK_EPOCH:
        intresult = ((int64) date + POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY;
        break;

      default:
        ereport(ERROR,
            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
             errmsg("unit \"%s\" not supported for type %s",
                lowunits, format_type_be(DATEOID))));
        intresult = 0;
    }
  }
  else
  {
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("unit \"%s\" not recognized for type %s",
            lowunits, format_type_be(DATEOID))));
    intresult = 0;
  }

  PG_RETURN_NUMERIC(int64_to_numeric(intresult));
}


/* Add an interval to a date, giving a new date.
 * Must handle both positive and negative intervals.
 *
 * We implement this by promoting the date to timestamp (without time zone)
 * and then using the timestamp plus interval function.
 */
Datum
date_pl_interval(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  Timestamp dateStamp;

  dateStamp = date2timestamp(dateVal);

  return DirectFunctionCall2(timestamp_pl_interval,
                 TimestampGetDatum(dateStamp),
                 PointerGetDatum(span));
}

/* Subtract an interval from a date, giving a new date.
 * Must handle both positive and negative intervals.
 *
 * We implement this by promoting the date to timestamp (without time zone)
 * and then using the timestamp minus interval function.
 */
Datum
date_mi_interval(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  Timestamp dateStamp;

  dateStamp = date2timestamp(dateVal);

  return DirectFunctionCall2(timestamp_mi_interval,
                 TimestampGetDatum(dateStamp),
                 PointerGetDatum(span));
}

/* date_timestamp()
 * Convert date to timestamp data type.
 */
Datum
date_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  Timestamp result;

  result = date2timestamp(dateVal);

  PG_RETURN_TIMESTAMP(result);
}

/* timestamp_date()
 * Convert timestamp to date data type.
 */
Datum
timestamp_date(PG_FUNCTION_ARGS)
{
  Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
  DateADT   result;

  result = timestamp2date_opt_overflow(timestamp, NULL);
  PG_RETURN_DATEADT(result);
}

/*
 * Convert timestamp to date.
 *
 * On successful conversion, *overflow is set to zero if it's not NULL.
 *
 * If the timestamp is finite but out of the valid range for date, then:
 * if overflow is NULL, we throw an out-of-range error.
 * if overflow is not NULL, we store +1 or -1 there to indicate the sign
 * of the overflow, and return the appropriate date infinity.
 *
 * Note: given the ranges of the types, overflow is only possible at
 * the minimum end of the range, but we don't assume that in this code.
 */
DateADT
timestamp2date_opt_overflow(Timestamp timestamp, int *overflow)
{
  DateADT   result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;

  if (overflow)
    *overflow = 0;

  if (TIMESTAMP_IS_NOBEGIN(timestamp))
    DATE_NOBEGIN(result);
  else if (TIMESTAMP_IS_NOEND(timestamp))
    DATE_NOEND(result);
  else
  {
    if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0)
    {
      if (overflow)
      {
        if (timestamp < 0)
        {
          *overflow = -1;
          DATE_NOBEGIN(result);
        }
        else
        {
          *overflow = 1;  /* not actually reachable */
          DATE_NOEND(result);
        }
        return result;
      }
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("timestamp out of range")));
    }

    result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
  }

  return result;
}


/* date_timestamptz()
 * Convert date to timestamp with time zone data type.
 */
Datum
date_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   dateVal = PG_GETARG_DATEADT(0);
  TimestampTz result;

  result = date2timestamptz(dateVal);

  PG_RETURN_TIMESTAMP(result);
}


/* timestamptz_date()
 * Convert timestamp with time zone to date data type.
 */
Datum
timestamptz_date(PG_FUNCTION_ARGS)
{
  TimestampTz timestamp = PG_GETARG_TIMESTAMP(0);
  DateADT   result;

  result = timestamptz2date_opt_overflow(timestamp, NULL);
  PG_RETURN_DATEADT(result);
}

/*
 * Convert timestamptz to date.
 *
 * On successful conversion, *overflow is set to zero if it's not NULL.
 *
 * If the timestamptz is finite but out of the valid range for date, then:
 * if overflow is NULL, we throw an out-of-range error.
 * if overflow is not NULL, we store +1 or -1 there to indicate the sign
 * of the overflow, and return the appropriate date infinity.
 *
 * Note: given the ranges of the types, overflow is only possible at
 * the minimum end of the range, but we don't assume that in this code.
 */
DateADT
timestamptz2date_opt_overflow(TimestampTz timestamp, int *overflow)
{
  DateADT   result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  int     tz;

  if (overflow)
    *overflow = 0;

  if (TIMESTAMP_IS_NOBEGIN(timestamp))
    DATE_NOBEGIN(result);
  else if (TIMESTAMP_IS_NOEND(timestamp))
    DATE_NOEND(result);
  else
  {
    if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
    {
      if (overflow)
      {
        if (timestamp < 0)
        {
          *overflow = -1;
          DATE_NOBEGIN(result);
        }
        else
        {
          *overflow = 1;  /* not actually reachable */
          DATE_NOEND(result);
        }
        return result;
      }
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("timestamp out of range")));
    }

    result = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
  }

  return result;
}


/*****************************************************************************
 *   Time ADT
 *****************************************************************************/

Datum
time_in(PG_FUNCTION_ARGS)
{
  char     *str = PG_GETARG_CSTRING(0);
#ifdef NOT_USED
  Oid     typelem = PG_GETARG_OID(1);
#endif
  int32   typmod = PG_GETARG_INT32(2);
  Node     *escontext = fcinfo->context;
  TimeADT   result;
  fsec_t    fsec;
  struct pg_tm tt,
         *tm = &tt;
  int     tz;
  int     nf;
  int     dterr;
  char    workbuf[MAXDATELEN + 1];
  char     *field[MAXDATEFIELDS];
  int     dtype;
  int     ftype[MAXDATEFIELDS];
  DateTimeErrorExtra extra;

  dterr = ParseDateTime(str, workbuf, sizeof(workbuf),
              field, ftype, MAXDATEFIELDS, &nf);
  if (dterr == 0)
    dterr = DecodeTimeOnly(field, ftype, nf,
                 &dtype, tm, &fsec, &tz, &extra);
  if (dterr != 0)
  {
    DateTimeParseError(dterr, &extra, str, "time", escontext);
    PG_RETURN_NULL();
  }

  tm2time(tm, fsec, &result);
  AdjustTimeForTypmod(&result, typmod);

  PG_RETURN_TIMEADT(result);
}

/* tm2time()
 * Convert a tm structure to a time data type.
 */
int
tm2time(struct pg_tm *tm, fsec_t fsec, TimeADT *result)
{
  *result = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec)
         * USECS_PER_SEC) + fsec;
  return 0;
}

/* time_overflows()
 * Check to see if a broken-down time-of-day is out of range.
 */
bool
time_overflows(int hour, int min, int sec, fsec_t fsec)
{
  /* Range-check the fields individually. */
  if (hour < 0 || hour > HOURS_PER_DAY ||
    min < 0 || min >= MINS_PER_HOUR ||
    sec < 0 || sec > SECS_PER_MINUTE ||
    fsec < 0 || fsec > USECS_PER_SEC)
    return true;

  /*
   * Because we allow, eg, hour = 24 or sec = 60, we must check separately
   * that the total time value doesn't exceed 24:00:00.
   */
  if ((((((hour * MINS_PER_HOUR + min) * SECS_PER_MINUTE)
       + sec) * USECS_PER_SEC) + fsec) > USECS_PER_DAY)
    return true;

  return false;
}

/* float_time_overflows()
 * Same, when we have seconds + fractional seconds as one "double" value.
 */
bool
float_time_overflows(int hour, int min, double sec)
{
  /* Range-check the fields individually. */
  if (hour < 0 || hour > HOURS_PER_DAY ||
    min < 0 || min >= MINS_PER_HOUR)
    return true;

  /*
   * "sec", being double, requires extra care.  Cope with NaN, and round off
   * before applying the range check to avoid unexpected errors due to
   * imprecise input.  (We assume rint() behaves sanely with infinities.)
   */
  if (isnan(sec))
    return true;
  sec = rint(sec * USECS_PER_SEC);
  if (sec < 0 || sec > SECS_PER_MINUTE * USECS_PER_SEC)
    return true;

  /*
   * Because we allow, eg, hour = 24 or sec = 60, we must check separately
   * that the total time value doesn't exceed 24:00:00.  This must match the
   * way that callers will convert the fields to a time.
   */
  if (((((hour * MINS_PER_HOUR + min) * SECS_PER_MINUTE)
      * USECS_PER_SEC) + (int64) sec) > USECS_PER_DAY)
    return true;

  return false;
}


/* time2tm()
 * Convert time data type to POSIX time structure.
 *
 * Note that only the hour/min/sec/fractional-sec fields are filled in.
 */
int
time2tm(TimeADT time, struct pg_tm *tm, fsec_t *fsec)
{
  tm->tm_hour = time / USECS_PER_HOUR;
  time -= tm->tm_hour * USECS_PER_HOUR;
  tm->tm_min = time / USECS_PER_MINUTE;
  time -= tm->tm_min * USECS_PER_MINUTE;
  tm->tm_sec = time / USECS_PER_SEC;
  time -= tm->tm_sec * USECS_PER_SEC;
  *fsec = time;
  return 0;
}

Datum
time_out(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  char     *result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  char    buf[MAXDATELEN + 1];

  time2tm(time, tm, &fsec);
  EncodeTimeOnly(tm, fsec, false, 0, DateStyle, buf);

  result = pstrdup(buf);
  PG_RETURN_CSTRING(result);
}

/*
 *    time_recv     - converts external binary format to time
 */
Datum
time_recv(PG_FUNCTION_ARGS)
{
  StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);

#ifdef NOT_USED
  Oid     typelem = PG_GETARG_OID(1);
#endif
  int32   typmod = PG_GETARG_INT32(2);
  TimeADT   result;

  result = pq_getmsgint64(buf);

  if (result < INT64CONST(0) || result > USECS_PER_DAY)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("time out of range")));

  AdjustTimeForTypmod(&result, typmod);

  PG_RETURN_TIMEADT(result);
}

/*
 *    time_send     - converts time to binary format
 */
Datum
time_send(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  StringInfoData buf;

  pq_begintypsend(&buf);
  pq_sendint64(&buf, time);
  PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

Datum
timetypmodin(PG_FUNCTION_ARGS)
{
  ArrayType  *ta = PG_GETARG_ARRAYTYPE_P(0);

  PG_RETURN_INT32(anytime_typmodin(false, ta));
}

Datum
timetypmodout(PG_FUNCTION_ARGS)
{
  int32   typmod = PG_GETARG_INT32(0);

  PG_RETURN_CSTRING(anytime_typmodout(false, typmod));
}

/*
 *    make_time     - time constructor
 */
Datum
make_time(PG_FUNCTION_ARGS)
{
  int     tm_hour = PG_GETARG_INT32(0);
  int     tm_min = PG_GETARG_INT32(1);
  double    sec = PG_GETARG_FLOAT8(2);
  TimeADT   time;

  /* Check for time overflow */
  if (float_time_overflows(tm_hour, tm_min, sec))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
         errmsg("time field value out of range: %d:%02d:%02g",
            tm_hour, tm_min, sec)));

  /* This should match tm2time */
  time = (((tm_hour * MINS_PER_HOUR + tm_min) * SECS_PER_MINUTE)
      * USECS_PER_SEC) + (int64) rint(sec * USECS_PER_SEC);

  PG_RETURN_TIMEADT(time);
}


/* time_support()
 *
 * Planner support function for the time_scale() and timetz_scale()
 * length coercion functions (we need not distinguish them here).
 */
Datum
time_support(PG_FUNCTION_ARGS)
{
  Node     *rawreq = (Node *) PG_GETARG_POINTER(0);
  Node     *ret = NULL;

  if (IsA(rawreq, SupportRequestSimplify))
  {
    SupportRequestSimplify *req = (SupportRequestSimplify *) rawreq;

    ret = TemporalSimplify(MAX_TIME_PRECISION, (Node *) req->fcall);
  }

  PG_RETURN_POINTER(ret);
}

/* time_scale()
 * Adjust time type for specified scale factor.
 * Used by PostgreSQL type system to stuff columns.
 */
Datum
time_scale(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  int32   typmod = PG_GETARG_INT32(1);
  TimeADT   result;

  result = time;
  AdjustTimeForTypmod(&result, typmod);

  PG_RETURN_TIMEADT(result);
}

/* AdjustTimeForTypmod()
 * Force the precision of the time value to a specified value.
 * Uses *exactly* the same code as in AdjustTimestampForTypmod()
 * but we make a separate copy because those types do not
 * have a fundamental tie together but rather a coincidence of
 * implementation. - thomas
 */
void
AdjustTimeForTypmod(TimeADT *time, int32 typmod)
{
  static const int64 TimeScales[MAX_TIME_PRECISION + 1] = {
    INT64CONST(1000000),
    INT64CONST(100000),
    INT64CONST(10000),
    INT64CONST(1000),
    INT64CONST(100),
    INT64CONST(10),
    INT64CONST(1)
  };

  static const int64 TimeOffsets[MAX_TIME_PRECISION + 1] = {
    INT64CONST(500000),
    INT64CONST(50000),
    INT64CONST(5000),
    INT64CONST(500),
    INT64CONST(50),
    INT64CONST(5),
    INT64CONST(0)
  };

  if (typmod >= 0 && typmod <= MAX_TIME_PRECISION)
  {
    if (*time >= INT64CONST(0))
      *time = ((*time + TimeOffsets[typmod]) / TimeScales[typmod]) *
        TimeScales[typmod];
    else
      *time = -((((-*time) + TimeOffsets[typmod]) / TimeScales[typmod]) *
            TimeScales[typmod]);
  }
}


Datum
time_eq(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 == time2);
}

Datum
time_ne(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 != time2);
}

Datum
time_lt(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 < time2);
}

Datum
time_le(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 <= time2);
}

Datum
time_gt(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 > time2);
}

Datum
time_ge(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_BOOL(time1 >= time2);
}

Datum
time_cmp(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  if (time1 < time2)
    PG_RETURN_INT32(-1);
  if (time1 > time2)
    PG_RETURN_INT32(1);
  PG_RETURN_INT32(0);
}

Datum
time_hash(PG_FUNCTION_ARGS)
{
  return hashint8(fcinfo);
}

Datum
time_hash_extended(PG_FUNCTION_ARGS)
{
  return hashint8extended(fcinfo);
}

Datum
time_larger(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_TIMEADT((time1 > time2) ? time1 : time2);
}

Datum
time_smaller(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);

  PG_RETURN_TIMEADT((time1 < time2) ? time1 : time2);
}

/* overlaps_time() --- implements the SQL OVERLAPS operator.
 *
 * Algorithm is per SQL spec.  This is much harder than you'd think
 * because the spec requires us to deliver a non-null answer in some cases
 * where some of the inputs are null.
 */
Datum
overlaps_time(PG_FUNCTION_ARGS)
{
  /*
   * The arguments are TimeADT, but we leave them as generic Datums to avoid
   * dereferencing nulls (TimeADT is pass-by-reference!)
   */
  Datum   ts1 = PG_GETARG_DATUM(0);
  Datum   te1 = PG_GETARG_DATUM(1);
  Datum   ts2 = PG_GETARG_DATUM(2);
  Datum   te2 = PG_GETARG_DATUM(3);
  bool    ts1IsNull = PG_ARGISNULL(0);
  bool    te1IsNull = PG_ARGISNULL(1);
  bool    ts2IsNull = PG_ARGISNULL(2);
  bool    te2IsNull = PG_ARGISNULL(3);

#define TIMEADT_GT(t1,t2) \
  (DatumGetTimeADT(t1) > DatumGetTimeADT(t2))
#define TIMEADT_LT(t1,t2) \
  (DatumGetTimeADT(t1) < DatumGetTimeADT(t2))

  /*
   * If both endpoints of interval 1 are null, the result is null (unknown).
   * If just one endpoint is null, take ts1 as the non-null one. Otherwise,
   * take ts1 as the lesser endpoint.
   */
  if (ts1IsNull)
  {
    if (te1IsNull)
      PG_RETURN_NULL();
    /* swap null for non-null */
    ts1 = te1;
    te1IsNull = true;
  }
  else if (!te1IsNull)
  {
    if (TIMEADT_GT(ts1, te1))
    {
      Datum   tt = ts1;

      ts1 = te1;
      te1 = tt;
    }
  }

  /* Likewise for interval 2. */
  if (ts2IsNull)
  {
    if (te2IsNull)
      PG_RETURN_NULL();
    /* swap null for non-null */
    ts2 = te2;
    te2IsNull = true;
  }
  else if (!te2IsNull)
  {
    if (TIMEADT_GT(ts2, te2))
    {
      Datum   tt = ts2;

      ts2 = te2;
      te2 = tt;
    }
  }

  /*
   * At this point neither ts1 nor ts2 is null, so we can consider three
   * cases: ts1 > ts2, ts1 < ts2, ts1 = ts2
   */
  if (TIMEADT_GT(ts1, ts2))
  {
    /*
     * This case is ts1 < te2 OR te1 < te2, which may look redundant but
     * in the presence of nulls it's not quite completely so.
     */
    if (te2IsNull)
      PG_RETURN_NULL();
    if (TIMEADT_LT(ts1, te2))
      PG_RETURN_BOOL(true);
    if (te1IsNull)
      PG_RETURN_NULL();

    /*
     * If te1 is not null then we had ts1 <= te1 above, and we just found
     * ts1 >= te2, hence te1 >= te2.
     */
    PG_RETURN_BOOL(false);
  }
  else if (TIMEADT_LT(ts1, ts2))
  {
    /* This case is ts2 < te1 OR te2 < te1 */
    if (te1IsNull)
      PG_RETURN_NULL();
    if (TIMEADT_LT(ts2, te1))
      PG_RETURN_BOOL(true);
    if (te2IsNull)
      PG_RETURN_NULL();

    /*
     * If te2 is not null then we had ts2 <= te2 above, and we just found
     * ts2 >= te1, hence te2 >= te1.
     */
    PG_RETURN_BOOL(false);
  }
  else
  {
    /*
     * For ts1 = ts2 the spec says te1 <> te2 OR te1 = te2, which is a
     * rather silly way of saying "true if both are nonnull, else null".
     */
    if (te1IsNull || te2IsNull)
      PG_RETURN_NULL();
    PG_RETURN_BOOL(true);
  }

#undef TIMEADT_GT
#undef TIMEADT_LT
}

/* timestamp_time()
 * Convert timestamp to time data type.
 */
Datum
timestamp_time(PG_FUNCTION_ARGS)
{
  Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
  TimeADT   result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;

  if (TIMESTAMP_NOT_FINITE(timestamp))
    PG_RETURN_NULL();

  if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("timestamp out of range")));

  /*
   * Could also do this with time = (timestamp / USECS_PER_DAY *
   * USECS_PER_DAY) - timestamp;
   */
  result = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec) *
        USECS_PER_SEC) + fsec;

  PG_RETURN_TIMEADT(result);
}

/* timestamptz_time()
 * Convert timestamptz to time data type.
 */
Datum
timestamptz_time(PG_FUNCTION_ARGS)
{
  TimestampTz timestamp = PG_GETARG_TIMESTAMP(0);
  TimeADT   result;
  struct pg_tm tt,
         *tm = &tt;
  int     tz;
  fsec_t    fsec;

  if (TIMESTAMP_NOT_FINITE(timestamp))
    PG_RETURN_NULL();

  if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("timestamp out of range")));

  /*
   * Could also do this with time = (timestamp / USECS_PER_DAY *
   * USECS_PER_DAY) - timestamp;
   */
  result = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec) *
        USECS_PER_SEC) + fsec;

  PG_RETURN_TIMEADT(result);
}

/* datetime_timestamp()
 * Convert date and time to timestamp data type.
 */
Datum
datetime_timestamp(PG_FUNCTION_ARGS)
{
  DateADT   date = PG_GETARG_DATEADT(0);
  TimeADT   time = PG_GETARG_TIMEADT(1);
  Timestamp result;

  result = date2timestamp(date);
  if (!TIMESTAMP_NOT_FINITE(result))
  {
    result += time;
    if (!IS_VALID_TIMESTAMP(result))
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("timestamp out of range")));
  }

  PG_RETURN_TIMESTAMP(result);
}

/* time_interval()
 * Convert time to interval data type.
 */
Datum
time_interval(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  Interval   *result;

  result = (Interval *) palloc(sizeof(Interval));

  result->time = time;
  result->day = 0;
  result->month = 0;

  PG_RETURN_INTERVAL_P(result);
}

/* interval_time()
 * Convert interval to time data type.
 *
 * This is defined as producing the fractional-day portion of the interval.
 * Therefore, we can just ignore the months field.  It is not real clear
 * what to do with negative intervals, but we choose to subtract the floor,
 * so that, say, '-2 hours' becomes '22:00:00'.
 */
Datum
interval_time(PG_FUNCTION_ARGS)
{
  Interval   *span = PG_GETARG_INTERVAL_P(0);
  TimeADT   result;

  if (INTERVAL_NOT_FINITE(span))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot convert infinite interval to time")));

  result = span->time % USECS_PER_DAY;
  if (result < 0)
    result += USECS_PER_DAY;

  PG_RETURN_TIMEADT(result);
}

/* time_mi_time()
 * Subtract two times to produce an interval.
 */
Datum
time_mi_time(PG_FUNCTION_ARGS)
{
  TimeADT   time1 = PG_GETARG_TIMEADT(0);
  TimeADT   time2 = PG_GETARG_TIMEADT(1);
  Interval   *result;

  result = (Interval *) palloc(sizeof(Interval));

  result->month = 0;
  result->day = 0;
  result->time = time1 - time2;

  PG_RETURN_INTERVAL_P(result);
}

/* time_pl_interval()
 * Add interval to time.
 */
Datum
time_pl_interval(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  TimeADT   result;

  if (INTERVAL_NOT_FINITE(span))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot add infinite interval to time")));

  result = time + span->time;
  result -= result / USECS_PER_DAY * USECS_PER_DAY;
  if (result < INT64CONST(0))
    result += USECS_PER_DAY;

  PG_RETURN_TIMEADT(result);
}

/* time_mi_interval()
 * Subtract interval from time.
 */
Datum
time_mi_interval(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  TimeADT   result;

  if (INTERVAL_NOT_FINITE(span))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot subtract infinite interval from time")));

  result = time - span->time;
  result -= result / USECS_PER_DAY * USECS_PER_DAY;
  if (result < INT64CONST(0))
    result += USECS_PER_DAY;

  PG_RETURN_TIMEADT(result);
}

/*
 * in_range support function for time.
 */
Datum
in_range_time_interval(PG_FUNCTION_ARGS)
{
  TimeADT   val = PG_GETARG_TIMEADT(0);
  TimeADT   base = PG_GETARG_TIMEADT(1);
  Interval   *offset = PG_GETARG_INTERVAL_P(2);
  bool    sub = PG_GETARG_BOOL(3);
  bool    less = PG_GETARG_BOOL(4);
  TimeADT   sum;

  /*
   * Like time_pl_interval/time_mi_interval, we disregard the month and day
   * fields of the offset.  So our test for negative should too.  This also
   * catches -infinity, so we only need worry about +infinity below.
   */
  if (offset->time < 0)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PRECEDING_OR_FOLLOWING_SIZE),
         errmsg("invalid preceding or following size in window function")));

  /*
   * We can't use time_pl_interval/time_mi_interval here, because their
   * wraparound behavior would give wrong (or at least undesirable) answers.
   * Fortunately the equivalent non-wrapping behavior is trivial, except
   * that adding an infinite (or very large) interval might cause integer
   * overflow.  Subtraction cannot overflow here.
   */
  if (sub)
    sum = base - offset->time;
  else if (pg_add_s64_overflow(base, offset->time, &sum))
    PG_RETURN_BOOL(less);

  if (less)
    PG_RETURN_BOOL(val <= sum);
  else
    PG_RETURN_BOOL(val >= sum);
}


/* time_part() and extract_time()
 * Extract specified field from time type.
 */
static Datum
time_part_common(PG_FUNCTION_ARGS, bool retnumeric)
{
  text     *units = PG_GETARG_TEXT_PP(0);
  TimeADT   time = PG_GETARG_TIMEADT(1);
  int64   intresult;
  int     type,
        val;
  char     *lowunits;

  lowunits = downcase_truncate_identifier(VARDATA_ANY(units),
                      VARSIZE_ANY_EXHDR(units),
                      false);

  type = DecodeUnits(0, lowunits, &val);
  if (type == UNKNOWN_FIELD)
    type = DecodeSpecial(0, lowunits, &val);

  if (type == UNITS)
  {
    fsec_t    fsec;
    struct pg_tm tt,
           *tm = &tt;

    time2tm(time, tm, &fsec);

    switch (val)
    {
      case DTK_MICROSEC:
        intresult = tm->tm_sec * INT64CONST(1000000) + fsec;
        break;

      case DTK_MILLISEC:
        if (retnumeric)
          /*---
           * tm->tm_sec * 1000 + fsec / 1000
           * = (tm->tm_sec * 1'000'000 + fsec) / 1000
           */
          PG_RETURN_NUMERIC(int64_div_fast_to_numeric(tm->tm_sec * INT64CONST(1000000) + fsec, 3));
        else
          PG_RETURN_FLOAT8(tm->tm_sec * 1000.0 + fsec / 1000.0);
        break;

      case DTK_SECOND:
        if (retnumeric)
          /*---
           * tm->tm_sec + fsec / 1'000'000
           * = (tm->tm_sec * 1'000'000 + fsec) / 1'000'000
           */
          PG_RETURN_NUMERIC(int64_div_fast_to_numeric(tm->tm_sec * INT64CONST(1000000) + fsec, 6));
        else
          PG_RETURN_FLOAT8(tm->tm_sec + fsec / 1000000.0);
        break;

      case DTK_MINUTE:
        intresult = tm->tm_min;
        break;

      case DTK_HOUR:
        intresult = tm->tm_hour;
        break;

      case DTK_TZ:
      case DTK_TZ_MINUTE:
      case DTK_TZ_HOUR:
      case DTK_DAY:
      case DTK_MONTH:
      case DTK_QUARTER:
      case DTK_YEAR:
      case DTK_DECADE:
      case DTK_CENTURY:
      case DTK_MILLENNIUM:
      case DTK_ISOYEAR:
      default:
        ereport(ERROR,
            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
             errmsg("unit \"%s\" not supported for type %s",
                lowunits, format_type_be(TIMEOID))));
        intresult = 0;
    }
  }
  else if (type == RESERV && val == DTK_EPOCH)
  {
    if (retnumeric)
      PG_RETURN_NUMERIC(int64_div_fast_to_numeric(time, 6));
    else
      PG_RETURN_FLOAT8(time / 1000000.0);
  }
  else
  {
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("unit \"%s\" not recognized for type %s",
            lowunits, format_type_be(TIMEOID))));
    intresult = 0;
  }

  if (retnumeric)
    PG_RETURN_NUMERIC(int64_to_numeric(intresult));
  else
    PG_RETURN_FLOAT8(intresult);
}

Datum
time_part(PG_FUNCTION_ARGS)
{
  return time_part_common(fcinfo, false);
}

Datum
extract_time(PG_FUNCTION_ARGS)
{
  return time_part_common(fcinfo, true);
}


/*****************************************************************************
 *   Time With Time Zone ADT
 *****************************************************************************/

/* tm2timetz()
 * Convert a tm structure to a time data type.
 */
int
tm2timetz(struct pg_tm *tm, fsec_t fsec, int tz, TimeTzADT *result)
{
  result->time = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec) *
          USECS_PER_SEC) + fsec;
  result->zone = tz;

  return 0;
}

Datum
timetz_in(PG_FUNCTION_ARGS)
{
  char     *str = PG_GETARG_CSTRING(0);
#ifdef NOT_USED
  Oid     typelem = PG_GETARG_OID(1);
#endif
  int32   typmod = PG_GETARG_INT32(2);
  Node     *escontext = fcinfo->context;
  TimeTzADT  *result;
  fsec_t    fsec;
  struct pg_tm tt,
         *tm = &tt;
  int     tz;
  int     nf;
  int     dterr;
  char    workbuf[MAXDATELEN + 1];
  char     *field[MAXDATEFIELDS];
  int     dtype;
  int     ftype[MAXDATEFIELDS];
  DateTimeErrorExtra extra;

  dterr = ParseDateTime(str, workbuf, sizeof(workbuf),
              field, ftype, MAXDATEFIELDS, &nf);
  if (dterr == 0)
    dterr = DecodeTimeOnly(field, ftype, nf,
                 &dtype, tm, &fsec, &tz, &extra);
  if (dterr != 0)
  {
    DateTimeParseError(dterr, &extra, str, "time with time zone",
               escontext);
    PG_RETURN_NULL();
  }

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));
  tm2timetz(tm, fsec, tz, result);
  AdjustTimeForTypmod(&(result->time), typmod);

  PG_RETURN_TIMETZADT_P(result);
}

Datum
timetz_out(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(0);
  char     *result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  int     tz;
  char    buf[MAXDATELEN + 1];

  timetz2tm(time, tm, &fsec, &tz);
  EncodeTimeOnly(tm, fsec, true, tz, DateStyle, buf);

  result = pstrdup(buf);
  PG_RETURN_CSTRING(result);
}

/*
 *    timetz_recv     - converts external binary format to timetz
 */
Datum
timetz_recv(PG_FUNCTION_ARGS)
{
  StringInfo  buf = (StringInfo) PG_GETARG_POINTER(0);

#ifdef NOT_USED
  Oid     typelem = PG_GETARG_OID(1);
#endif
  int32   typmod = PG_GETARG_INT32(2);
  TimeTzADT  *result;

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = pq_getmsgint64(buf);

  if (result->time < INT64CONST(0) || result->time > USECS_PER_DAY)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("time out of range")));

  result->zone = pq_getmsgint(buf, sizeof(result->zone));

  /* Check for sane GMT displacement; see notes in datatype/timestamp.h */
  if (result->zone <= -TZDISP_LIMIT || result->zone >= TZDISP_LIMIT)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_TIME_ZONE_DISPLACEMENT_VALUE),
         errmsg("time zone displacement out of range")));

  AdjustTimeForTypmod(&(result->time), typmod);

  PG_RETURN_TIMETZADT_P(result);
}

/*
 *    timetz_send     - converts timetz to binary format
 */
Datum
timetz_send(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(0);
  StringInfoData buf;

  pq_begintypsend(&buf);
  pq_sendint64(&buf, time->time);
  pq_sendint32(&buf, time->zone);
  PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

Datum
timetztypmodin(PG_FUNCTION_ARGS)
{
  ArrayType  *ta = PG_GETARG_ARRAYTYPE_P(0);

  PG_RETURN_INT32(anytime_typmodin(true, ta));
}

Datum
timetztypmodout(PG_FUNCTION_ARGS)
{
  int32   typmod = PG_GETARG_INT32(0);

  PG_RETURN_CSTRING(anytime_typmodout(true, typmod));
}


/* timetz2tm()
 * Convert TIME WITH TIME ZONE data type to POSIX time structure.
 */
int
timetz2tm(TimeTzADT *time, struct pg_tm *tm, fsec_t *fsec, int *tzp)
{
  TimeOffset  trem = time->time;

  tm->tm_hour = trem / USECS_PER_HOUR;
  trem -= tm->tm_hour * USECS_PER_HOUR;
  tm->tm_min = trem / USECS_PER_MINUTE;
  trem -= tm->tm_min * USECS_PER_MINUTE;
  tm->tm_sec = trem / USECS_PER_SEC;
  *fsec = trem - tm->tm_sec * USECS_PER_SEC;

  if (tzp != NULL)
    *tzp = time->zone;

  return 0;
}

/* timetz_scale()
 * Adjust time type for specified scale factor.
 * Used by PostgreSQL type system to stuff columns.
 */
Datum
timetz_scale(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(0);
  int32   typmod = PG_GETARG_INT32(1);
  TimeTzADT  *result;

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = time->time;
  result->zone = time->zone;

  AdjustTimeForTypmod(&(result->time), typmod);

  PG_RETURN_TIMETZADT_P(result);
}


static int
timetz_cmp_internal(TimeTzADT *time1, TimeTzADT *time2)
{
  TimeOffset  t1,
        t2;

  /* Primary sort is by true (GMT-equivalent) time */
  t1 = time1->time + (time1->zone * USECS_PER_SEC);
  t2 = time2->time + (time2->zone * USECS_PER_SEC);

  if (t1 > t2)
    return 1;
  if (t1 < t2)
    return -1;

  /*
   * If same GMT time, sort by timezone; we only want to say that two
   * timetz's are equal if both the time and zone parts are equal.
   */
  if (time1->zone > time2->zone)
    return 1;
  if (time1->zone < time2->zone)
    return -1;

  return 0;
}

Datum
timetz_eq(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) == 0);
}

Datum
timetz_ne(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) != 0);
}

Datum
timetz_lt(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) < 0);
}

Datum
timetz_le(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) <= 0);
}

Datum
timetz_gt(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) > 0);
}

Datum
timetz_ge(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_BOOL(timetz_cmp_internal(time1, time2) >= 0);
}

Datum
timetz_cmp(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);

  PG_RETURN_INT32(timetz_cmp_internal(time1, time2));
}

Datum
timetz_hash(PG_FUNCTION_ARGS)
{
  TimeTzADT  *key = PG_GETARG_TIMETZADT_P(0);
  uint32    thash;

  /*
   * To avoid any problems with padding bytes in the struct, we figure the
   * field hashes separately and XOR them.
   */
  thash = DatumGetUInt32(DirectFunctionCall1(hashint8,
                         Int64GetDatumFast(key->time)));
  thash ^= DatumGetUInt32(hash_uint32(key->zone));
  PG_RETURN_UINT32(thash);
}

Datum
timetz_hash_extended(PG_FUNCTION_ARGS)
{
  TimeTzADT  *key = PG_GETARG_TIMETZADT_P(0);
  Datum   seed = PG_GETARG_DATUM(1);
  uint64    thash;

  /* Same approach as timetz_hash */
  thash = DatumGetUInt64(DirectFunctionCall2(hashint8extended,
                         Int64GetDatumFast(key->time),
                         seed));
  thash ^= DatumGetUInt64(hash_uint32_extended(key->zone,
                         DatumGetInt64(seed)));
  PG_RETURN_UINT64(thash);
}

Datum
timetz_larger(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);
  TimeTzADT  *result;

  if (timetz_cmp_internal(time1, time2) > 0)
    result = time1;
  else
    result = time2;
  PG_RETURN_TIMETZADT_P(result);
}

Datum
timetz_smaller(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time1 = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *time2 = PG_GETARG_TIMETZADT_P(1);
  TimeTzADT  *result;

  if (timetz_cmp_internal(time1, time2) < 0)
    result = time1;
  else
    result = time2;
  PG_RETURN_TIMETZADT_P(result);
}

/* timetz_pl_interval()
 * Add interval to timetz.
 */
Datum
timetz_pl_interval(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  TimeTzADT  *result;

  if (INTERVAL_NOT_FINITE(span))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot add infinite interval to time")));

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = time->time + span->time;
  result->time -= result->time / USECS_PER_DAY * USECS_PER_DAY;
  if (result->time < INT64CONST(0))
    result->time += USECS_PER_DAY;

  result->zone = time->zone;

  PG_RETURN_TIMETZADT_P(result);
}

/* timetz_mi_interval()
 * Subtract interval from timetz.
 */
Datum
timetz_mi_interval(PG_FUNCTION_ARGS)
{
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(0);
  Interval   *span = PG_GETARG_INTERVAL_P(1);
  TimeTzADT  *result;

  if (INTERVAL_NOT_FINITE(span))
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("cannot subtract infinite interval from time")));

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = time->time - span->time;
  result->time -= result->time / USECS_PER_DAY * USECS_PER_DAY;
  if (result->time < INT64CONST(0))
    result->time += USECS_PER_DAY;

  result->zone = time->zone;

  PG_RETURN_TIMETZADT_P(result);
}

/*
 * in_range support function for timetz.
 */
Datum
in_range_timetz_interval(PG_FUNCTION_ARGS)
{
  TimeTzADT  *val = PG_GETARG_TIMETZADT_P(0);
  TimeTzADT  *base = PG_GETARG_TIMETZADT_P(1);
  Interval   *offset = PG_GETARG_INTERVAL_P(2);
  bool    sub = PG_GETARG_BOOL(3);
  bool    less = PG_GETARG_BOOL(4);
  TimeTzADT sum;

  /*
   * Like timetz_pl_interval/timetz_mi_interval, we disregard the month and
   * day fields of the offset.  So our test for negative should too. This
   * also catches -infinity, so we only need worry about +infinity below.
   */
  if (offset->time < 0)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PRECEDING_OR_FOLLOWING_SIZE),
         errmsg("invalid preceding or following size in window function")));

  /*
   * We can't use timetz_pl_interval/timetz_mi_interval here, because their
   * wraparound behavior would give wrong (or at least undesirable) answers.
   * Fortunately the equivalent non-wrapping behavior is trivial, except
   * that adding an infinite (or very large) interval might cause integer
   * overflow.  Subtraction cannot overflow here.
   */
  if (sub)
    sum.time = base->time - offset->time;
  else if (pg_add_s64_overflow(base->time, offset->time, &sum.time))
    PG_RETURN_BOOL(less);
  sum.zone = base->zone;

  if (less)
    PG_RETURN_BOOL(timetz_cmp_internal(val, &sum) <= 0);
  else
    PG_RETURN_BOOL(timetz_cmp_internal(val, &sum) >= 0);
}

/* overlaps_timetz() --- implements the SQL OVERLAPS operator.
 *
 * Algorithm is per SQL spec.  This is much harder than you'd think
 * because the spec requires us to deliver a non-null answer in some cases
 * where some of the inputs are null.
 */
Datum
overlaps_timetz(PG_FUNCTION_ARGS)
{
  /*
   * The arguments are TimeTzADT *, but we leave them as generic Datums for
   * convenience of notation --- and to avoid dereferencing nulls.
   */
  Datum   ts1 = PG_GETARG_DATUM(0);
  Datum   te1 = PG_GETARG_DATUM(1);
  Datum   ts2 = PG_GETARG_DATUM(2);
  Datum   te2 = PG_GETARG_DATUM(3);
  bool    ts1IsNull = PG_ARGISNULL(0);
  bool    te1IsNull = PG_ARGISNULL(1);
  bool    ts2IsNull = PG_ARGISNULL(2);
  bool    te2IsNull = PG_ARGISNULL(3);

#define TIMETZ_GT(t1,t2) \
  DatumGetBool(DirectFunctionCall2(timetz_gt,t1,t2))
#define TIMETZ_LT(t1,t2) \
  DatumGetBool(DirectFunctionCall2(timetz_lt,t1,t2))

  /*
   * If both endpoints of interval 1 are null, the result is null (unknown).
   * If just one endpoint is null, take ts1 as the non-null one. Otherwise,
   * take ts1 as the lesser endpoint.
   */
  if (ts1IsNull)
  {
    if (te1IsNull)
      PG_RETURN_NULL();
    /* swap null for non-null */
    ts1 = te1;
    te1IsNull = true;
  }
  else if (!te1IsNull)
  {
    if (TIMETZ_GT(ts1, te1))
    {
      Datum   tt = ts1;

      ts1 = te1;
      te1 = tt;
    }
  }

  /* Likewise for interval 2. */
  if (ts2IsNull)
  {
    if (te2IsNull)
      PG_RETURN_NULL();
    /* swap null for non-null */
    ts2 = te2;
    te2IsNull = true;
  }
  else if (!te2IsNull)
  {
    if (TIMETZ_GT(ts2, te2))
    {
      Datum   tt = ts2;

      ts2 = te2;
      te2 = tt;
    }
  }

  /*
   * At this point neither ts1 nor ts2 is null, so we can consider three
   * cases: ts1 > ts2, ts1 < ts2, ts1 = ts2
   */
  if (TIMETZ_GT(ts1, ts2))
  {
    /*
     * This case is ts1 < te2 OR te1 < te2, which may look redundant but
     * in the presence of nulls it's not quite completely so.
     */
    if (te2IsNull)
      PG_RETURN_NULL();
    if (TIMETZ_LT(ts1, te2))
      PG_RETURN_BOOL(true);
    if (te1IsNull)
      PG_RETURN_NULL();

    /*
     * If te1 is not null then we had ts1 <= te1 above, and we just found
     * ts1 >= te2, hence te1 >= te2.
     */
    PG_RETURN_BOOL(false);
  }
  else if (TIMETZ_LT(ts1, ts2))
  {
    /* This case is ts2 < te1 OR te2 < te1 */
    if (te1IsNull)
      PG_RETURN_NULL();
    if (TIMETZ_LT(ts2, te1))
      PG_RETURN_BOOL(true);
    if (te2IsNull)
      PG_RETURN_NULL();

    /*
     * If te2 is not null then we had ts2 <= te2 above, and we just found
     * ts2 >= te1, hence te2 >= te1.
     */
    PG_RETURN_BOOL(false);
  }
  else
  {
    /*
     * For ts1 = ts2 the spec says te1 <> te2 OR te1 = te2, which is a
     * rather silly way of saying "true if both are nonnull, else null".
     */
    if (te1IsNull || te2IsNull)
      PG_RETURN_NULL();
    PG_RETURN_BOOL(true);
  }

#undef TIMETZ_GT
#undef TIMETZ_LT
}


Datum
timetz_time(PG_FUNCTION_ARGS)
{
  TimeTzADT  *timetz = PG_GETARG_TIMETZADT_P(0);
  TimeADT   result;

  /* swallow the time zone and just return the time */
  result = timetz->time;

  PG_RETURN_TIMEADT(result);
}


Datum
time_timetz(PG_FUNCTION_ARGS)
{
  TimeADT   time = PG_GETARG_TIMEADT(0);
  TimeTzADT  *result;
  struct pg_tm tt,
         *tm = &tt;
  fsec_t    fsec;
  int     tz;

  GetCurrentDateTime(tm);
  time2tm(time, tm, &fsec);
  tz = DetermineTimeZoneOffset(tm, session_timezone);

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = time;
  result->zone = tz;

  PG_RETURN_TIMETZADT_P(result);
}


/* timestamptz_timetz()
 * Convert timestamp to timetz data type.
 */
Datum
timestamptz_timetz(PG_FUNCTION_ARGS)
{
  TimestampTz timestamp = PG_GETARG_TIMESTAMP(0);
  TimeTzADT  *result;
  struct pg_tm tt,
         *tm = &tt;
  int     tz;
  fsec_t    fsec;

  if (TIMESTAMP_NOT_FINITE(timestamp))
    PG_RETURN_NULL();

  if (timestamp2tm(timestamp, &tz, tm, &fsec, NULL, NULL) != 0)
    ereport(ERROR,
        (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
         errmsg("timestamp out of range")));

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  tm2timetz(tm, fsec, tz, result);

  PG_RETURN_TIMETZADT_P(result);
}


/* datetimetz_timestamptz()
 * Convert date and timetz to timestamp with time zone data type.
 * Timestamp is stored in GMT, so add the time zone
 * stored with the timetz to the result.
 * - thomas 2000-03-10
 */
Datum
datetimetz_timestamptz(PG_FUNCTION_ARGS)
{
  DateADT   date = PG_GETARG_DATEADT(0);
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(1);
  TimestampTz result;

  if (DATE_IS_NOBEGIN(date))
    TIMESTAMP_NOBEGIN(result);
  else if (DATE_IS_NOEND(date))
    TIMESTAMP_NOEND(result);
  else
  {
    /*
     * Date's range is wider than timestamp's, so check for boundaries.
     * Since dates have the same minimum values as timestamps, only upper
     * boundary need be checked for overflow.
     */
    if (date >= (TIMESTAMP_END_JULIAN - POSTGRES_EPOCH_JDATE))
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("date out of range for timestamp")));
    result = date * USECS_PER_DAY + time->time + time->zone * USECS_PER_SEC;

    /*
     * Since it is possible to go beyond allowed timestamptz range because
     * of time zone, check for allowed timestamp range after adding tz.
     */
    if (!IS_VALID_TIMESTAMP(result))
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("date out of range for timestamp")));
  }

  PG_RETURN_TIMESTAMP(result);
}


/* timetz_part() and extract_timetz()
 * Extract specified field from time type.
 */
static Datum
timetz_part_common(PG_FUNCTION_ARGS, bool retnumeric)
{
  text     *units = PG_GETARG_TEXT_PP(0);
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(1);
  int64   intresult;
  int     type,
        val;
  char     *lowunits;

  lowunits = downcase_truncate_identifier(VARDATA_ANY(units),
                      VARSIZE_ANY_EXHDR(units),
                      false);

  type = DecodeUnits(0, lowunits, &val);
  if (type == UNKNOWN_FIELD)
    type = DecodeSpecial(0, lowunits, &val);

  if (type == UNITS)
  {
    int     tz;
    fsec_t    fsec;
    struct pg_tm tt,
           *tm = &tt;

    timetz2tm(time, tm, &fsec, &tz);

    switch (val)
    {
      case DTK_TZ:
        intresult = -tz;
        break;

      case DTK_TZ_MINUTE:
        intresult = (-tz / SECS_PER_MINUTE) % MINS_PER_HOUR;
        break;

      case DTK_TZ_HOUR:
        intresult = -tz / SECS_PER_HOUR;
        break;

      case DTK_MICROSEC:
        intresult = tm->tm_sec * INT64CONST(1000000) + fsec;
        break;

      case DTK_MILLISEC:
        if (retnumeric)
          /*---
           * tm->tm_sec * 1000 + fsec / 1000
           * = (tm->tm_sec * 1'000'000 + fsec) / 1000
           */
          PG_RETURN_NUMERIC(int64_div_fast_to_numeric(tm->tm_sec * INT64CONST(1000000) + fsec, 3));
        else
          PG_RETURN_FLOAT8(tm->tm_sec * 1000.0 + fsec / 1000.0);
        break;

      case DTK_SECOND:
        if (retnumeric)
          /*---
           * tm->tm_sec + fsec / 1'000'000
           * = (tm->tm_sec * 1'000'000 + fsec) / 1'000'000
           */
          PG_RETURN_NUMERIC(int64_div_fast_to_numeric(tm->tm_sec * INT64CONST(1000000) + fsec, 6));
        else
          PG_RETURN_FLOAT8(tm->tm_sec + fsec / 1000000.0);
        break;

      case DTK_MINUTE:
        intresult = tm->tm_min;
        break;

      case DTK_HOUR:
        intresult = tm->tm_hour;
        break;

      case DTK_DAY:
      case DTK_MONTH:
      case DTK_QUARTER:
      case DTK_YEAR:
      case DTK_DECADE:
      case DTK_CENTURY:
      case DTK_MILLENNIUM:
      default:
        ereport(ERROR,
            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
             errmsg("unit \"%s\" not supported for type %s",
                lowunits, format_type_be(TIMETZOID))));
        intresult = 0;
    }
  }
  else if (type == RESERV && val == DTK_EPOCH)
  {
    if (retnumeric)
      /*---
       * time->time / 1'000'000 + time->zone
       * = (time->time + time->zone * 1'000'000) / 1'000'000
       */
      PG_RETURN_NUMERIC(int64_div_fast_to_numeric(time->time + time->zone * INT64CONST(1000000), 6));
    else
      PG_RETURN_FLOAT8(time->time / 1000000.0 + time->zone);
  }
  else
  {
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("unit \"%s\" not recognized for type %s",
            lowunits, format_type_be(TIMETZOID))));
    intresult = 0;
  }

  if (retnumeric)
    PG_RETURN_NUMERIC(int64_to_numeric(intresult));
  else
    PG_RETURN_FLOAT8(intresult);
}


Datum
timetz_part(PG_FUNCTION_ARGS)
{
  return timetz_part_common(fcinfo, false);
}

Datum
extract_timetz(PG_FUNCTION_ARGS)
{
  return timetz_part_common(fcinfo, true);
}

/* timetz_zone()
 * Encode time with time zone type with specified time zone.
 * Applies DST rules as of the transaction start time.
 */
Datum
timetz_zone(PG_FUNCTION_ARGS)
{
  text     *zone = PG_GETARG_TEXT_PP(0);
  TimeTzADT  *t = PG_GETARG_TIMETZADT_P(1);
  TimeTzADT  *result;
  int     tz;
  char    tzname[TZ_STRLEN_MAX + 1];
  int     type,
        val;
  pg_tz    *tzp;

  /*
   * Look up the requested timezone.
   */
  text_to_cstring_buffer(zone, tzname, sizeof(tzname));

  type = DecodeTimezoneName(tzname, &val, &tzp);

  if (type == TZNAME_FIXED_OFFSET)
  {
    /* fixed-offset abbreviation */
    tz = -val;
  }
  else if (type == TZNAME_DYNTZ)
  {
    /* dynamic-offset abbreviation, resolve using transaction start time */
    TimestampTz now = GetCurrentTransactionStartTimestamp();
    int     isdst;

    tz = DetermineTimeZoneAbbrevOffsetTS(now, tzname, tzp, &isdst);
  }
  else
  {
    /* Get the offset-from-GMT that is valid now for the zone name */
    TimestampTz now = GetCurrentTransactionStartTimestamp();
    struct pg_tm tm;
    fsec_t    fsec;

    if (timestamp2tm(now, &tz, &tm, &fsec, NULL, tzp) != 0)
      ereport(ERROR,
          (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
           errmsg("timestamp out of range")));
  }

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = t->time + (t->zone - tz) * USECS_PER_SEC;
  /* C99 modulo has the wrong sign convention for negative input */
  while (result->time < INT64CONST(0))
    result->time += USECS_PER_DAY;
  if (result->time >= USECS_PER_DAY)
    result->time %= USECS_PER_DAY;

  result->zone = tz;

  PG_RETURN_TIMETZADT_P(result);
}

/* timetz_izone()
 * Encode time with time zone type with specified time interval as time zone.
 */
Datum
timetz_izone(PG_FUNCTION_ARGS)
{
  Interval   *zone = PG_GETARG_INTERVAL_P(0);
  TimeTzADT  *time = PG_GETARG_TIMETZADT_P(1);
  TimeTzADT  *result;
  int     tz;

  if (INTERVAL_NOT_FINITE(zone))
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("interval time zone \"%s\" must be finite",
            DatumGetCString(DirectFunctionCall1(interval_out,
                              PointerGetDatum(zone))))));

  if (zone->month != 0 || zone->day != 0)
    ereport(ERROR,
        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
         errmsg("interval time zone \"%s\" must not include months or days",
            DatumGetCString(DirectFunctionCall1(interval_out,
                              PointerGetDatum(zone))))));

  tz = -(zone->time / USECS_PER_SEC);

  result = (TimeTzADT *) palloc(sizeof(TimeTzADT));

  result->time = time->time + (time->zone - tz) * USECS_PER_SEC;
  /* C99 modulo has the wrong sign convention for negative input */
  while (result->time < INT64CONST(0))
    result->time += USECS_PER_DAY;
  if (result->time >= USECS_PER_DAY)
    result->time %= USECS_PER_DAY;

  result->zone = tz;

  PG_RETURN_TIMETZADT_P(result);
}

/* timetz_at_local()
 *
 * Unlike for timestamp[tz]_at_local, the type for timetz does not flip between
 * time with/without time zone, so we cannot just call the conversion function.
 */
Datum
timetz_at_local(PG_FUNCTION_ARGS)
{
  Datum   time = PG_GETARG_DATUM(0);
  const char *tzn = pg_get_timezone_name(session_timezone);
  Datum   zone = PointerGetDatum(cstring_to_text(tzn));

  return DirectFunctionCall2(timetz_zone, zone, time);
}

Coverage Report

Created: 2025-09-27 06:52