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@DOWI[date[,format]] :  Returns an integer representing the day of the week for the specified date (1 = Sunday, 2 = Monday, etc.). See date formats for information on acceptable date formats.

 

@DOWI accepts an optional second parameter specifying the date format:

 

0default
1USA (mm/dd/yy)
2Europe (dd/mm/yy)
3Japan (yy/mm/dd)
4ISO (yyyy-mm-dd)
5ISO 8601 yyyy-Www-d
6ISO 8601 yyyy-ddd

 

Examples:

 

echo %@dowi[01-01-1980]

3

 

echo %@dowi[%_date]

1