Date Calculator

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Find the days between two dates, or add and subtract years, months, weeks and days from a date.

How the calculation works

In the first mode, the calculator counts the years, months and days between two dates, along with the total days and the weekdays. In the second mode, it adds or subtracts the time you enter and shows the resulting date with its day of the week.

Formula used

Total days = (end date − start date) ÷ 86,400,000 ms

Example

45 days after 13 October 2026 is Friday, 27 November 2026.

Frequently asked questions

Is the end date counted?

The result is the elapsed time between the dates, not inclusive of both.

What happens at the end of a month?

Adding one month to 31 January gives 28 February, the last day of the month.

Results are estimates for general information only and are not professional financial, medical or legal advice.