The WEEKNUM Function in Excel will return the week number for a specific date. This function will return an integer from 1 to 52 representing the corresponding week based on a standard calendar year.
- Serial_number (required argument) – Excel date for which we want to return the week number.
- Return_type (optional argument) – This specifies which numbering system should be used and which day of the week should be treated as the start of the week. See the chart below. Default in Sunday.
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WEEKNUM Function Usage Example
In the example below, the function returns the week of each date. In all of the examples, we have the Return_Type set to 1. This means that each week starts are Sunday.