Date difference
Count calendar days and weeks between two dates.
Date & timeISO week number
Find the ISO week number and week-year. Weeks begin on Monday.
Input
Result
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How to use iso week number
Set Date. Select Run tool, then review the result. Use the download or copy controls to keep it. Reset restores the starting settings and clears the result.
ISO week 1 contains January 4. Dates near New Year may belong to the previous or following ISO week-year.
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