Week Number Calculator

Finds the ISO 8601 week number for a given date. Enter a date, like "2024-01-01".

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Finds the ISO 8601 week number for a given date. Enter a date, like "2024-01-01".

Use cases

  • Filling in a timesheet or report that tracks by week number
  • Checking which calendar week a date falls in

Examples

January 1st, 2024

2024-01-01
{"iso_year": 2024, "week": 1, "iso_week": "2024-W01"}

FAQ

Is my data sent to a server?

Yes — the calculation runs on the server for this tool.

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