TestDateValue.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
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package org.apache.poi.ss.formula.functions;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.time.LocalDate;
import java.time.Month;
import java.time.Year;
import java.time.temporal.ChronoUnit;
import java.util.Locale;

import org.apache.poi.ss.formula.eval.*;
import org.apache.poi.util.LocaleUtil;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

/**
 * Tests for Excel function DATEVALUE()
 */
final class TestDateValue {

    @BeforeAll
    public static void init() {
        LocaleUtil.setUserLocale(Locale.US);
    }

    @AfterAll
    public static void clear() {
        LocaleUtil.setUserLocale(null);
    }

    @Test
    void testDateValue() {
        int days1900 = (int)ChronoUnit.DAYS.between(
            LocalDate.of(1899, Month.DECEMBER, 31),
            LocalDate.of(Year.now(LocaleUtil.getUserTimeZone().toZoneId()).getValue(), Month.FEBRUARY, 1)
        )+1;
        confirmDateValue(new StringEval("2020-02-01"), 43862);
        confirmDateValue(new StringEval("01-02-2020"), 43862);
        confirmDateValue(new StringEval("2020-FEB-01"), 43862);
        confirmDateValue(new StringEval("2020-Feb-01"), 43862);
        confirmDateValue(new StringEval("2020-FEBRUARY-01"), 43862);
        confirmDateValue(new StringEval("FEB-01"), days1900);
        confirmDateValue(new StringEval("2/1/2020"), 43862);
        confirmDateValue(new StringEval("2/1"), days1900);
        confirmDateValue(new StringEval("2020/2/1"), 43862);
        confirmDateValue(new StringEval("2020/FEB/1"), 43862);
        confirmDateValue(new StringEval("FEB/1/2020"), 43862);
        confirmDateValue(new StringEval("2020/02/01"), 43862);

        confirmDateValueError(new StringEval(""));
        confirmDateValueError(BlankEval.instance);

        confirmDateValueError(new StringEval("non-date text"));
        confirmDateValueError(new StringEval("2/32/2020"));
        confirmDateValueError(new StringEval("32/2/2020"));
        confirmDateValueError(new StringEval("32/32/2020"));

        confirmDateValueError(new StringEval("non-date text"));

        // // EXCEL
        confirmDateValue(new StringEval("8/22/2011"), 40777); // Serial number of a date entered as text.
        confirmDateValue(new StringEval("22-MAY-2011"), 40685); // Serial number of a date entered as text.
        confirmDateValue(new StringEval("2011/02/23"), 40597); // Serial number of a date entered as text.

        //ignore time parts
        confirmDateValue(new StringEval("8/22/2011 12:00"), 40777); // Serial number of a date entered as text.
        confirmDateValue(new StringEval("8/22/2011 6:02:23 PM"), 40777); // Serial number of a date entered as text.
        confirmDateValue(new StringEval("22-AUG-2011 6:02:23PM"), 40777); // Serial number of a date entered as text.
        confirmDateValue(new StringEval("22-AUG-2011 6:02:23AM"), 40777); // Serial number of a date entered as text.

        // LibreOffice compatibility
        confirmDateValue(new StringEval("1954-07-20"), 19925);
    }

    @Test
    void testInvalidDateValue() {
        assertEquals(ErrorEval.VALUE_INVALID, invokeDateValue(new StringEval("not-date")),
                "not-date evals to invalid");
        assertEquals(ErrorEval.VALUE_INVALID, invokeDateValue(BoolEval.FALSE),
                "false evals to invalid");
        assertEquals(ErrorEval.VALUE_INVALID, invokeDateValue(new NumberEval(Math.E)),
                "Math.E evals to invalid");
    }

    private ValueEval invokeDateValue(ValueEval text) {
        return new DateValue().evaluate(0, 0, text);
    }

    private void confirmDateValue(ValueEval text, double expected) {
        ValueEval result = invokeDateValue(text);
        assertEquals(NumberEval.class, result.getClass());
        assertEquals(expected, ((NumberEval) result).getNumberValue(), 0.0001);
    }

    private void confirmDateValueError(ValueEval text) {
        ValueEval result = invokeDateValue(text);
        assertEquals(ErrorEval.class, result.getClass());
        assertEquals(ErrorEval.VALUE_INVALID.getErrorCode(), ((ErrorEval) result).getErrorCode());
    }
}