Date Calculator

Calculate the difference between two dates, or add/subtract time from a date.

Start Date

End Date

Difference

6yr 4mo 20d

Total days2,332

Total weeks333

Total months76

Working days (Mon–Fri)1,667

About this tool

Calculate the exact number of days, weeks, months, and years between any two dates - or add and subtract days from a date to find a future or past date. Correctly handles leap years, month lengths, and calendar edge cases. Useful for project deadlines, contract durations, delivery estimates, and visa validity periods.

How to Calculate the Difference Between Two Dates

1Select 'Date difference' mode.
2Enter the start date and end date using the date pickers.
3The result shows days, weeks, months, and years between the two dates.
4Switch to 'Add/subtract' mode to find a date N days from any start date.

Frequently Asked Questions

How many days between two dates?+

Enter both dates and the calculator shows the exact number of calendar days, weeks, months, and years between them, accounting for leap years.

How do I add 90 days to a date?+

Switch to 'Add/subtract days' mode, enter your start date, type 90 in the days field, and click Calculate. The tool shows the resulting date.

Does the calculator count the start and end dates?+

By default it calculates the interval between dates (start date is day 0). Toggle 'Include end date' to count both the start and end as full days.

How do I calculate a business day deadline?+

Switch to 'Business days' mode which excludes Saturdays and Sundays. For holidays, manually add the number of bank holidays in your range.

Looking for a deeper guide on this topic? Browse the Searchlight blog.

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