Does the calculation account for daylight-saving changes?
Date-only calculations use UTC calendar arithmetic, so daylight-saving clock changes do not add or remove a day.
Date Calculator
Compare dates, shift calendar durations, and plan dates around a configurable workweek.
Workspace
Compare two calendar dates
Use a preset or select any start and end date.
Select two dates to calculate their difference.
Business calendar
Select the weekdays that should not count as working days.
0 valid holidays
GuideHow to use
- Choose date difference, add or subtract, or business date mode.
- Use a preset or select dates, then configure duration, non-working weekdays, and optional holiday dates.
- Review the live calendar and business-day breakdown, then copy or download the result.
HelpFrequently asked questions
How are months and years calculated?
The calendar result uses complete years, then complete months, then remaining days. When both dates are included, the calendar breakdown and total-day count both include the full ending date.
What counts as a business day?
Any weekday not selected as a non-working day and not listed as a custom holiday. Saturday and Sunday are excluded by default, but you can configure a different workweek.
What happens when adding a month to the 29th, 30th, or 31st?
If the target month does not contain that date, the result clamps to its final valid day. For example, one month after 31 January is 28 February, or 29 February in a leap year.
Can I add a calculated date to my calendar?
Yes. Add or subtract and Business date modes can download the result as an all-day iCalendar file for compatible calendar applications.
Keep working
Related tools
Date, Time & PlanningAge Calculator
Calculate exact age, compare birthdays, and plan upcoming birthday milestones.
Date, Time & PlanningTime Zone Converter
Plan meetings across world time zones with daylight-saving and working-hours context.
Date, Time & PlanningWork Hours & Timesheet Calculator
Plan shifts, daily and weekly overtime, hour targets, and estimated pay.