extISWEEKEND function

dynamic extISWEEKEND(
  1. dynamic value
)

ISWEEKEND(date): whether it's Saturday or Sunday

Implementation

dynamic extISWEEKEND(dynamic value) {
  final dt = _vToDateTime(value);
  if (dt == null) return false;
  return dt.weekday == DateTime.saturday || dt.weekday == DateTime.sunday;
}