Instant.utc constructor
Instant.utc(])
Implementation
factory Instant.utc(int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minuteOfHour, [int secondOfMinute = 0]) {
var days = LocalDate(year, monthOfYear, dayOfMonth).epochDay;
var nanoOfDay = LocalTime(hourOfDay, minuteOfHour, secondOfMinute).timeSinceMidnight.inNanoseconds;
return Instant._trusted(Time(days: days, nanoseconds: nanoOfDay));
}