differenceInCalendarDays function

int differenceInCalendarDays(DateTime startDate, DateTime endDate)

Calculates the difference in calendar days between startDate and endDate.

startDate: The starting date. endDate: The ending date.

Returns the difference in calendar days between startDate and endDate.

Implementation

int differenceInCalendarDays(
  DateTime startDate,
  DateTime endDate,
) {
  DateTime startDay = startOfDay(startDate);
  DateTime endDay = startOfDay(endDate);
  double timestampStart = startDay.millisecondsSinceEpoch -
      (startDay.timeZoneOffset.inMilliseconds.toDouble());
  double timestampEnd = endDay.millisecondsSinceEpoch -
      (endDay.timeZoneOffset.inMilliseconds.toDouble());
  double millisecondsInDay = 86400000;
  double days = (timestampEnd - timestampStart) / millisecondsInDay;
  return days.round();
}