Date Calculator
Calculate the difference between two dates or add and subtract time from a date.
How to Use the Date Calculator
Select whether you want to compare two dates or add or subtract time from a date. Enter the required dates and time values, then run the calculation to see the result.
Practical Example
If you compare January 1, 2026 with January 31, 2026, the calculator reports a 30-day difference. In add or subtract mode, adding 14 days to January 1 returns January 15.
Factors That Affect the Result
Month length, leap years, start and end date order, and calendar-based month or year adjustments can change the result. Date calculations use calendar dates rather than assuming every month has the same number of days.
Frequently Asked Questions
Can I calculate days between two dates?
Yes. Enter a start date and an end date to calculate the elapsed time.
Can I add months or years to a date?
Yes. Use the add or subtract mode and enter the desired number of years, months, weeks or days.
Does the calculator account for leap years?
Yes. Browser date calculations account for the actual calendar dates involved.