format method
Format and output the duration.
Enter the format of the date and time in format.
Implementation
String format(String format) {
assert(format.isNotEmpty, "The format is empty.");
String twoDigits(int n) => n.toString().padLeft(2, "0");
return format
.replaceAll("dd", inDays.toString())
.replaceAll("HH", twoDigits(inHours))
.replaceAll("mm", twoDigits(inMinutes.remainder(60)))
.replaceAll("ss", twoDigits(inSeconds.remainder(60)));
}