@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:

 

 

Examples:

 

echo %@dowi[01-01-1980]

3

 

echo %@dowi[%_date]

1