Add or subtract weeks from a date
Useful for follow ups and schedules set in weeks; the result always falls on the same weekday.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter date, operation and number of weeks.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Result = date ± (number of weeks × 7) days.
Example
Inputs: Date = 2026-10-01, Operation = Add, Number of weeks = 6 weeks. Result: Resulting date: Thursday, November 12, 2026 (2026-11-12); Day of the week: Thursday; Difference in days: 42.
Limits and caveats
- A week here is 7 calendar days, not a working week.
Questions about this tool
Why is the weekday the same?
Every week is exactly 7 days, so adding whole weeks keeps the weekday.
How many days are 12 weeks?
They are 84 days, shown in the difference line.
Can I subtract weeks?
Yes, choose Subtract to get the date that many weeks earlier.