firstDayOfYear property

DateTime get firstDayOfYear

Returns DateTime object of First Day of the week.

final checkDate =
     DateTime.parse('2023-09-16 20:18:00.123456789z');
checkDate.firstDayOfWeek;         // 11-09-2023

This will not consider time Parameters.

Implementation

DateTime get firstDayOfYear => DateTime(year, 1, 1);