WeekRule
Defines the available rules for defining a week.
Values
FirstDay- Specifies that the first week of the year starts on the first day of the year and ends before the following designated first day of the week.FirstFullWeek- Specifies that the first week of the year begins on the first occurrence of the designated first day of the week on or after the first day of the year.FirstFourDayWeek- Specifies that the first week of the year is the first week with four or more days before the designated first day of the week.