Week Number Calculator
Find the week number for any date and navigate through weeks.
Current Week
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Week -- of ----
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Results
What is this tool?
A Week Number Calculator is a tool that determines the ISO week number for any given date. ISO 8601 defines week 1 as the week containing the first Thursday of the year, with weeks starting on Monday. This is useful for project planning, scheduling, reporting, and understanding time periods in a standardized format.
How to use this tool?
1. Enter or select a date
2. View the ISO week number for that date
3. See which week of the year it belongs to
4. Navigate to previous or next weeks
5. Find dates for specific week numbers
6. Use for project planning and scheduling