Date Calculator - Add or Subtract Days, Months, Years
Add or subtract days, months, or years from any date. Calculate future deadlines, expiration dates, or past dates quickly and accurately with our date math calculator.
Result
January 31, 2026
30 days after January 1, 2026
How to Use
- Select a start date using the date picker
- Choose whether to add or subtract time
- Enter a number value
- Select the time unit (days, months, or years)
- Click "Calculate" to see the resulting date
FAQ
How are months calculated?
When adding or subtracting months, we adjust to the same day of the month, accounting for different month lengths.
What about leap years?
Yes, the calculator automatically accounts for leap years in date calculations.
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