description

# toString method

String toString()
override

Returns a string representation of this Duration.

Returns a string with hours, minutes, seconds, and microseconds, in the following format: `H:MM:SS.mmmmmm`. For example,

    var d = const Duration(days: 1, hours: 1, minutes: 33, microseconds: 500);
    print(d.toString()); // 25:33:00.000500

    d = const Duration(hours: 1, minutes: 10, microseconds: 500);
    print(d.toString()); // 1:10:00.000500

## Implementation

    String toString() {
      var microseconds = inMicroseconds;
      var sign = "";
      var negative = microseconds < 0;

      var hours = microseconds ~/ microsecondsPerHour;
      microseconds = microseconds.remainder(microsecondsPerHour);

      // Correcting for being negative after first division, instead of before,
      // to avoid negating min-int, -(2^31-1), of a native int64.
      if (negative) {
        hours = 0 - hours; // Not using `-hours` to avoid creating -0.0 on web.
        microseconds = 0 - microseconds;
        sign = "-";
      }

      var minutes = microseconds ~/ microsecondsPerMinute;
      microseconds = microseconds.remainder(microsecondsPerMinute);

      var minutesPadding = minutes < 10 ? "0" : "";

      var seconds = microseconds ~/ microsecondsPerSecond;
      microseconds = microseconds.remainder(microsecondsPerSecond);

      var secondsPadding = seconds < 10 ? "0" : "";

      // Padding up to six digits for microseconds.
      var microsecondsText = microseconds.toString().padLeft(6, "0");

      return "$sign$hours:"
          "$minutesPadding$minutes:"
          "$secondsPadding$seconds."
          "$microsecondsText";
    }