toString method Null safety

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

d = Duration(days: 0, hours: 1, minutes: 10, microseconds: 500);
d.toString();  // "1:10:00.000500"

Implementation

String toString() {
  var microseconds = inMicroseconds;

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

  if (microseconds < 0) microseconds = -microseconds;

  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" : "";

  var paddedMicroseconds = microseconds.toString().padLeft(6, "0");
  return "$hours:"
      "$minutesPadding$minutes:"
      "$secondsPadding$seconds.$paddedMicroseconds";
}