Some add on explanation :D
WEEKDAY( serial_number, [return_value] )
serial_number is a date expressed as a serial number or a date in quotation marks.
return_value is optional. It is the option used to display the result. It can be any of the following values:
Value Explanation
1 Returns a number from 1 (Sunday) to 7 (Saturday). This is the default if parameter is omitted.
2 Returns a number from 1 (Monday) to 7 (Sunday).
3 Returns a number from 0 (Monday) to 6 (Sunday).
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