Date Calculator
Calculate date differences, add calendar units and count weekdays with your own holidays.
Ready when you are
Add / subtract calendar units
How to use
- Enter two dates and any holiday exclusions.
- Calculate days, calendar units and working weekdays.
- Use the second form to add or subtract calendar units.
A few things to know
Month additions clamp to the last day: January 31 + one month is the last day of February. Calendar days do not assume 24 hours.
Questions and answers
What happens when I add a month to January 31?
Month additions clamp to the last day: January 31 + one month is the last day of February. Calendar days do not assume 24 hours.
Is the end date included?
The end day is excluded by default. Enable Include end date to add the end day to the day count; the separate working-day count includes both boundary dates and excludes weekends and entered holidays.
Technical references: Calendar date arithmetic (Temporal)
Content updated: