Which modes does the calculator provide?
It calculates the difference between two dates and can also add or subtract years, months, weeks, and days from a start date.
Date Calculator
Date Calculator
Calculate date intervals or add and subtract periods.
Difference between two dates
Result
- Exact difference
- Total days
- Total weeks and days
- Start weekday
- End weekday
Add or subtract time
Result
- Calculated end date
- Weekday
How to use the date calculator
- To compare dates, enter a start date and an end date, then choose whether to include the last day.
- To reach another date, enter the start date, choose add or subtract, and fill in years, months, weeks, or days.
- Select the calculate button for the chosen mode to view the result and weekday.
Add two weeks to May 10, 2024
In period mode, enter May 10, 2024, select Add, and enter 2 in Weeks.
May 10, 2024 + 2 weeks = May 24, 2024
The tool displays May 24, 2024 and its corresponding weekday.
Useful situations
- Measure the interval between two valid dates, including days and weeks.
- Plan a future or earlier date with years, months, weeks, and days.
- Check the weekday for a start date, end date, or calculated date.
Notes and limitations
- Interval mode requires the end date to be the same as or later than the start date; otherwise it shows a notice.
- Selecting Include the last day changes the interval's total day count.
- In period mode, fields accept only non-negative integers; the selected operation determines whether they are added or subtracted.
Frequently asked questions
Can I enter an end date before the start date?
No. Interval mode requires the end date to be the same as or later than the start date.
What does including the last day change?
That option includes the end date in the interval's total day count.
Can I use negative periods?
No. Enter non-negative values and select Subtract when you need to move backward in time.