Get Week Number from a Date

Worked Example

Result: Returns the week number for the date.

Steps

• Confirm whether your report uses standard or ISO week numbering.
• Use WEEKNUM for common spreadsheet week numbers.
• Use ISOWEEKNUM when Monday-based ISO weeks are required.
• Keep the original date for sorting and filtering.

Common Mistakes

• Mixing WEEKNUM and ISOWEEKNUM in the same report.
• Using week numbers without year labels across multiple years.
• Converting dates to text too early.

Excel vs Google Sheets Notes

The core idea works in both Excel and Google Sheets, but separators, function availability, and array behavior can vary by account, locale, and version.

FAQ