Find Week of the Year

Want to know what week of the year a date falls in? The Find Week of the Year tool converts standard YYYY-MM-DD dates into their corresponding ISO week numbers. Whether you’re organizing time-based data or managing projects and schedules, this tool gives you instant week identification for any date.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .log, .json, .md, .xml, .html
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How to Use:

  1. Enter one or more dates in YYYY-MM-DD format into the input box.
  2. You can also import a list using the Choose File button.
  3. The tool will instantly calculate the week number for each entry.
  4. Use Copy Output or Export to File to save the results.
  5. Hit Clear All to reset everything and start fresh.

What Find Week of the Year Tool can do:

This tool identifies the ISO 8601 calendar week for each input date. It properly handles leap years and cross-year boundaries, making it ideal for financial, academic, or project tracking systems that rely on weekly reporting.

Example:

Input:

2024-01-01
2024-12-31
2025-05-18
2000-02-29

Output:

Week 1 of 2024
Week 1 of 2025
Week 20 of 2025
Week 9 of 2000

Common Use Cases:

Perfect for planning events, building timelines, analyzing weekly data trends, or syncing dates with ISO-based business calendars. Helps bring consistency to time-based records when week numbers matter more than specific dates.

Useful Tools & Suggestions:

If you want to zoom in closer, Find Week of the Month helps break things down within each calendar page. And for even more detail, Find Day of the Year shows exactly how far you’ve come.

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