numOfWeeks method

int numOfWeeks(
  1. int targetYear
)

Returns the number of ISO weeks in the specified year.

Implementation

int numOfWeeks(int targetYear) {
  final DateTime dec28 = DateTime(targetYear, DateTime.december, 28);
  final DateTime jan1 = DateTime(targetYear);
  final int dayOfDec28 = dec28.difference(jan1).inDays + 1;
  return ((dayOfDec28 - dec28.weekday + 10) / 7).floor();
}