ToolWren › Date Add

Date Add / Subtract Calculator

Add or subtract days, weeks, months or years from any date to find a future or past date.

100% client-side · nothing is uploaded

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How to use the Date Add

Fill in each input field with your own numbers.
Results calculate automatically and update as you change any value.
Read the result cards below the inputs for the full breakdown.
Adjust any field to explore different scenarios instantly.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Date Add

What it does

Pick a start date, an amount and a unit, and choose add or subtract to get the resulting date and its day of week.

Calendar-aware

It uses real calendar math, so month and year additions handle differing month lengths and leap years correctly.

Where it helps

Deadlines, due dates, subscription renewals, and planning ahead or back from a date.

Frequently asked questions

Does it handle months correctly?

Yes — adding months respects different month lengths.

What if I leave the date blank?

It uses today's date.

Does it show the weekday?

Yes — the resulting day of the week is shown.