multiplyWithSign method
Implementation
Duration multiplyWithSign(Duration duration, int sign) {
return Duration(
days: duration.inDays * sign,
hours: duration.inHours.remainder(24) * sign,
minutes: duration.inMinutes.remainder(60) * sign,
seconds: duration.inSeconds.remainder(60) * sign,
milliseconds: duration.inMilliseconds.remainder(1000) * sign,
microseconds: duration.inMicroseconds.remainder(1000) * sign,
);
}