DateOnly constructor

DateOnly(int year, int month, int day)

Constructs a DateOnly from year, month, and day. Throws ArgumentError if components do not represent a valid date.

Implementation

DateOnly(this.year, this.month, this.day) {
  final dateTime = DateTime(year, month, day);
  // if the processed components are different, an overflow happened
  if (dateTime.year != year ||
      dateTime.month != month ||
      dateTime.day != day) {
    throw ArgumentError('components do not form a valid date');
  }
}