Add example
10 March 2026 + 1 year + 2 months + 5 days → 15 May 2027.
Free online date calculator to add or subtract days, months, and years from a start date. Use it for “90 days from today,” contract end dates, or any calendar offset — pick a Start date, choose Add or Subtract, enter amounts, and get the result instantly in your browser.
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Enter a start date and amounts to calculate.
Month arithmetic follows calendar rules (for example, 31 Jan + 1 month may land on the last day of February).
What is a date add / subtract calculator?
A date calculator (also called add calendar dates or date plus/minus) shifts a calendar date forward or backward by whole years, months, and days — useful for deadlines, contract ends, pregnancy due-date offsets, and questions like “what date is 90 days from now?”
Subtract example
1 July 2026 − 14 days → 17 June 2026.
90 days from a date
Set years and months to 0, enter 90 days, choose Add — the result is 90 calendar days later.
How it works
Choose a start date, then add or subtract years, months, and days. Calendar arithmetic follows normal date rules (for example, month lengths and leap days) in your local timezone. All math runs client-side — nothing is uploaded.
Date calculator FAQ
How do I add days to a date?
Pick the start date, leave years and months at 0 (or set them as needed), enter the number of days, choose Add, and read the result.
How do I subtract months from a date?
Enter the start date, set months (and optional years/days), choose Subtract, and the tool returns the earlier calendar date.
Does month arithmetic handle short months?
Yes. Offsets follow calendar rules (for example, 31 Jan + 1 month lands on the last day of February when needed).
Tips
- Use positive amounts with Add or Subtract mode as labeled on the form.
- Combine with the date difference calculator to verify spans.
- Check the weekday of the result with the weekday calculator.