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Date Calculator
Find the number of days between two dates (including working-day mode), add or subtract days from a date, and see year/month/day breakdowns. Runs locally.
100% Private & Secure
This tool runs in your browser.
Your data is never uploaded or stored.
How to use
- 1
Choose a mode: difference or add/subtract.
- 2
Enter the dates or days.
- 3
See the result with a detailed breakdown.
Why use this tool?
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Fast, instant results — no waiting, no page reloads.
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Clean, focused interface designed for developers.
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100% private — everything runs in your browser, nothing is uploaded to any server.
Frequently Asked Questions
Does the working-day mode exclude weekends?
Yes. It counts only Monday through Friday.
Can I include the end date?
Yes. Toggle the "include end date" option.