Date Calculator
Add or subtract days, weeks, months, and years from a date.
✅ 100% Free
🔒 Privacy First
⚡ Instant Results
Result date
—
—
| Start date | — |
|---|---|
| End date | — |
| Operation | — |
| Calendar days difference | — |
| Weeks | — |
| Months | — |
| Years | — |
| Business days counted | — |
| Weekend days skipped | — |
| Holidays skipped | — |
| Day of week | — |
| ISO week number | — |
What is a Date Calculator?
A date calculator performs arithmetic on calendar dates.
How to Use This Date Calculator
- Enter the start date.
- Choose to add or subtract.
- Enter the number of days, weeks, months, or years.
- Click Calculate.
How It Works
The tool adds or subtracts the chosen number of days, weeks, months, or years from the start date.
Example Calculation
1 October 2026 + 90 days = 30 December 2026.
Frequently Asked Questions
Does it handle leap years?
Yes. The calculation uses real calendar dates.
Privacy & Data Processing
All calculations run in your browser.
Last updated: 2026-09-01