Check the ISO week number for a date
Useful for weekly reports, sprint planning, and international scheduling.
Open exampleWeek number calculator
Look up ISO week number, week-year, weekday index, week start and end dates for a Gregorian date.
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FAQ
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What does Week number calculator do?
It helps you inspect or process this value and get a readable result quickly.
Is my input saved?
Local tools run in the browser when possible. Server-side checks only use the input needed to complete the lookup.
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