Since these constants are built into VBScript, you don't have to define them before using them. Use them anywhere in your code to represent the values shown for each.
|vbUseSystemDayOfWeek||0||Use the day of the week specified in your system settings for the first day of the week.|
|vbFirstJan1||1||Use the week in which January 1 occurs (default).|
|vbFirstFourDays||2||Use the first week that has at least four days in the new year.|
|vbFirstFullWeek||3||Use the first full week of the year.|