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final thisYear = DateTime.now().year;
final isLeap = DateTime(year, 2, 29).month == 2;2, 29 will become 3, 1 in non-leap years.
if calendar.isleap(datetime.date.today().year):
print('This year is a leap year.')y % 4 == 0 and (y % 100 != 0 or y % 400 == 0)let leap_year = year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);