Date Calculator
Difference between dates and shifting by an interval.
Ctrl+Enter runs. Ctrl+Shift+Backspace clears.
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Counts calendar years, months and days, total hours, and weekdays. Adding months clamps to the end of the target month.
About this tool
Find how many days are left until a deadline, how long ago something happened, or which date falls 90 days from today. The calculator counts calendar months correctly and also gives the number of weekdays.
How to use it
- 01
Choose Difference or Add interval.
- 02
Enter the start date, and either the end date or the months and days to add.
- 03
Read the result in years, months, days, hours and weekdays.
Frequently asked questions
How are months added to the end of a month?
The date is clamped to the last day of the target month, so January 31 plus one month gives February 28 or 29.
Does it count working days?
Yes. The difference also shows how many weekdays, Monday to Friday, lie between the dates.