Date Add/Subtract
Add or subtract time from any date
Date Add/Subtract is a free online tool from BrowserUtils that add or subtract time from any date. It runs entirely in your browser — your data never leaves your device. No account required.
How to use Date Add/Subtract
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Date Add/Subtract
Free online date add/subtract calculator. Add or subtract days, weeks, months, or years from any date to find a future or past date. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Date Add/Subtract specs
- Runtime
- 100% client-side (browser)
- Built on
- Native Date and Intl.DateTimeFormat APIs with full IANA timezone database support
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How do I add days to a date?
Enter your starting date, select "Add", choose the unit (days, weeks, months, or years), enter the amount, and the result will be calculated instantly.
Does adding months handle different month lengths?
Yes, adding months uses JavaScript native Date handling, which correctly rolls over when months have different lengths.
Can I subtract days from a date to find a past date?
Yes. Select "Subtract" mode, enter the number of days (or weeks, months, years), and the tool calculates the resulting past date.
What happens if I add 30 days to January 31?
The tool adds exactly 30 calendar days, landing on March 2 (or March 1 in a leap year). It counts actual days, not months, so there is no ambiguity.
Does the date add/subtract calculator work offline?
Yes. All date math runs in your browser using native JavaScript Date objects. No internet connection is required after the page loads.
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