DateTime.utc constructor Null safety
Constructs a DateTime instance specified in the UTC time zone.
var moonLanding = new DateTime.utc(1969, 7, 20, 20, 18, 04);
When dealing with dates or historic events prefer to use UTC DateTimes, since they are unaffected by daylight-saving changes and are unaffected by the local timezone.
DateTime.utc(int year, [int month = 1, int day = 1, int hour = 0, int minute = 0, int second = 0, int millisecond = 0, int microsecond = 0]) : this._internal(year, month, day, hour, minute, second, millisecond, microsecond, true);