Returns a number representing the week of the year, 1-52, where 1 is the first week in the year.
- date—The date from which to return the week of the year.
- Smartsheet calculates week numbers based on Mondays. Due to this, the first day of the year may not be in the first week of the year. For example, if January 1st is a Monday, WEEKNUMBER returns 1, however if it’s a Friday, WEEKNUMBER returns 52.