Date & Time Tools
Add/Subtract Time from Date
Add or subtract days, weeks, months, or years from any date.
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What is Add Time?
A calendar-aware date arithmetic tool. Add '3 months' to January 31 and you correctly get April 30, not a rolled-over May date.
How it works
Months and years are applied with clamping to the last valid day of the target month, then days/weeks are added as exact day offsets.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.