Date Calculator
Calculate date differences, add or subtract days from dates, and find days between two dates. Perfect for planning deadlines, events, and countdowns.
How to Calculate Dates
- 1 Choose Add/Subtract Days or Date Difference mode
- 2 Enter a start date using the date picker
- 3 For add/subtract: enter the number of days, weeks, or months
- 4 For difference: select an end date
- 5 Click Calculate to see the result with detailed breakdown
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1