DateDelta

Date Difference Calculator

Pick a start and end date — see the difference in every meaningful unit, including weekdays-only.

Start date

End date

Days: 91
Weeks: 13.00
Months (calendar): 3
Years (calendar): 0
Weekdays only (Mon–Fri): 66
Weekend days: 25

What you entered

Start date: 2026-09-08End date: 2026-12-08

1
Total days between dates
end − start= 91 days
2
Convert to weeks
91 ÷ 7= 13 weeks
3
Calendar months and years
calendar subtraction with borrowing= 0y 3m (3 months total)
4
Weekdays only (Mon–Fri)
count non-weekend days in range= 66 weekdays

Result

Days: 91

Between 2026-09-08 and 2026-12-08 there are 91 days (0y 3m on the calendar), including 66 weekdays.

Intervals between fixed dates

Days, weeks, months and years between two dates, with the working-day count alongside.

From	To	Days	Months	Years	Workdays
1 March 2026	1 June 2026	92	3	0	66
1 January 2026	4 July 2026	184	6	0	132
1 January 2026	31 December 2026	364	11	0	261
1 January 2000	1 January 2026	9,497	312	26	6,784
20 July 1969	1 January 2026	20,619	677	56	14,729

The third row gives 364 days rather than 365 because the interval is measured between the two dates rather than counting both endpoints - if your deadline is inclusive, add one. Months are whole months elapsed, which is why 1 January to 31 December reads 11 rather than 12. The 26-year row at 9,497 days shows the leap-day accumulation again: seven more than 26 times 365. Workdays exclude weekends but not public holidays.

Weekdays vs. business days

This tool counts weekdays as Monday–Friday. For true business days, you'd also subtract public holidays — which vary by country, region, and year.

Frequently asked questions

How many days between January 15 and March 20?

64 days (16 remaining in January + 28 in February + 20 in March). In a leap year, it would be 65 days. The calculator handles month lengths and leap years automatically — just pick the two dates.

How is this different from the age calculator?

The age calculator measures from a birth date to today and breaks the result into years/months/days. This tool takes any two dates (past, present, or future) and gives the exact gap in multiple units including weekdays-only. Use this for deadlines; use the age calculator for 'how old am I.'

I need to know the number of weekdays between two dates — does this handle that?

Yes — the calculator shows both total calendar days and weekdays (Monday-Friday) between your two dates. It doesn't account for public holidays, which vary by country. For weekday-only calculations, also check the business days calculator.