Weeknum
Returns the week number of the year for a given date. 【date】The specified date. 【startDayOfWeek】Optional, the start day of the week. By default, each week starts on Sunday (i.e., Sunday is 0). You can also set the start day to "Monday". The output of this function is an integer. For example, 6 means the date falls in the 6th week of the year.
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WEEKNUM
Returns the week number of the year for a given date. 【date】The specified date. 【startDayOfWeek】Optional, the start day of the week. By default, each week starts on Sunday (i.e., Sunday is 0). You can also set the start day to "Monday". The output of this function is an integer. For example, 6 means the date falls in the 6th week of the year.
Usage
WEEKNUM(date)
Example
WWEEKNUM(TODAY(), "Monday")

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