Plan deadlines
Add days, weeks or months from a start date to calculate due dates, reminders and milestone targets.
DateTimeHub Tool
Date Calculator
Add or subtract calendar units and precise time units from a starting date, with the adjusted result updating as you work.
Date Add / Subtract
Choose a starting date, enter an amount, and get the resulting date instantly. Use presets for common planning ranges.
Calculate a date
Timezone
Calendar math follows this timezone.
Operation
Amount
Result
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Date Add / Subtract FAQs
How do I add days to a date?
Enter the number under Days, or choose a preset such as 7 days or 30 days. The result updates immediately.
Can I subtract months safely?
Yes. Switch to Subtract. Month and year changes clamp to the last valid day when needed, such as moving from March 31 to February.
Does it account for leap years?
Leap years are respected by calendar math. Adding one year to February 29 lands on February 28 when the target year is not a leap year.
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.