Date Calculator
The Date Calculator adds or subtracts days, weeks, months, or years from a date, or finds the number of days between any two dates.
Result
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How it works
In "Add / Subtract" mode, this calculator moves a starting date forward or backward by the amount and unit you specify, correctly handling month lengths and leap years. In "Days Between" mode, it simply finds the absolute difference in days between two calendar dates.
Example: Adding 30 days to July 11, 2026 lands on August 10, 2026. The number of days between January 1, 2026 and July 11, 2026 is 191 days.
Related tools
For your exact age or the time between a birth date and today, see the Age Calculator. For clock-time math (hours, minutes, seconds), see the Time Calculator.