Creates a new Duration object whose value is the sum of all individual parts.
Individual parts can be larger than the next-bigger unit.
For example, hours
can be greater than 23.
All individual parts are allowed to be negative. All arguments are 0 by default.
Source
const Duration( {int days: 0, int hours: 0, int minutes: 0, int seconds: 0, int milliseconds: 0, int microseconds: 0}) : this._microseconds(microsecondsPerDay * days + microsecondsPerHour * hours + microsecondsPerMinute * minutes + microsecondsPerSecond * seconds + microsecondsPerMillisecond * milliseconds + microseconds);