Plan deadlines
Add days, weeks or months from a start date to calculate due dates, reminders and milestone targets.
Date Calculator
Add or subtract calendar units and precise time units from a starting date, with the adjusted result updating as you work.
Calculate a date
Choose a starting point, then add or subtract an amount.
Timezone
Calendar math follows this timezone.
Operation
Common amounts
Amount
Combine calendar units as needed.
Add precise time units
Use hours, minutes or seconds for exact offsets.
Result
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Useful ways to use this tool
Handle calendar edges
Month lengths, leap years and time zones can affect results, so the calculator shows the adjusted date directly.
Copy the result
Use the copy action when you need to paste the calculated date into a message, ticket or planning note.
Frequently asked questions
- How do I add days to a date?
- Choose a starting date, enter a value in the Days field, and keep the mode set to Add.
- Can I subtract months from a date?
- Yes. Switch to Subtract mode and enter the number of months to move the date backward.