Week Calculator: Count Weeks Between Dates

  • Adam
  • January 9, 2026

Calculate the number of weeks between two dates. Find the ISO week number for any date. Add or subtract weeks from a specific date.

Week Calculator

Weeks Between
Add/Sub Weeks
ISO Week Number
Result
0 Weeks

About Calculation

A standard week has 7 days. ISO weeks start on Monday.

$$ \text{Weeks} = \lfloor \frac{\text{Days}}{7} \rfloor \text{ (with remainder)} $$

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