What is a date calculator?
A date calculator helps you add or subtract time from a date, such as days, weeks, months, or years.
Date & Time
Date Calculator
Calculate dates directly in your browser. Add or subtract days, weeks, months, and years from any date and get the resulting calendar date instantly.
Tool
Date Calculator
Calculate dates directly in your browser. Add or subtract days, weeks, months, and years from any date and get the resulting calendar date instantly.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free date calculator to find a date before or after a specific day. Enter a start date, choose how many days, weeks, months, or years to add or subtract, and get the result instantly.
Conversion Formula
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Date calculation starts with the selected base date and applies the chosen offset. Days and weeks are added as calendar days, while months and years follow calendar rules such as different month lengths and leap years.
Examples
- Add 30 days to 2026-01-15 = 2026-02-14
- Subtract 2 weeks from 2026-06-10 = 2026-05-27
- Add 3 months to 2026-08-31 = 2026-11-30 when using end-of-month clamping
Frequently Asked Questions
Can I subtract days from a date?
Yes. You can use the calculator to find both future dates and past dates by adding or subtracting time.
Does the calculator handle leap years?
Yes. Date calculations can account for leap years and different month lengths when calculating the result.
Is this the same as a business days calculator?
No. This tool works with calendar days. For weekends or working days, use a business days calculator.
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