Date Difference Calculator

Written byOleh Soloninupdated 25 September 2026

Start Date

End Date

Last day

Result

Days74
Calendar breakdown2 months 15 days
Weeks and days10 weeks 4 days
Weekdays (Mon–Fri)52
Months (decimal)2.43

The gap between two dates, several ways

Count the days between two dates, with or without the end date, broken down into calendar months and days, weeks and weekdays.

Counting days by hand across a month boundary is where mistakes happen, especially when February or a leap year is involved.

The first question is always whether both endpoints count. From 1 to 14 July, 13 days pass, yet a holiday booked for those dates lasts 14 — the same off-by-one that ruins contract dates.

How to use

Pick the start and end dates. Either order works; putting the earlier date second gives a negative count.
Decide whether the end date counts: exclude it for “how many days have passed”, include it for how long something lasts, such as leave from 1 to 14 July.
Read off the total days, the calendar breakdown such as “2 months 15 days”, weeks and weekdays.

Should the end date count?

By default the calculator counts elapsed days: 1 to 2 January is one day. That answers “how long ago” and “how long until”.

When you measure a duration — leave, a rental, a trip — both the first and the last day usually count. Choose “Include”: 1 to 14 July becomes 14 days, and 1 January to 31 December becomes 365. If a contract or authority sets the rule, its own wording decides.

Worked out with this calculator. 2028 is a leap year, so the same span is a day longer.
Span	End date	Days	Calendar	Weekdays
1 January – 1 March 2026	excluded	59	2 months	42
1 January – 1 March 2028	excluded	60	2 months	42
1 January – 1 April 2026	excluded	90	3 months	64
1 – 14 July 2026	included	14	14 days	10
1 January – 31 December 2026	included	365	1 year	261

How months and days are counted

The calendar breakdown counts whole months from the start date and gives the remainder in days. 1 January to 16 March 2026 is 2 months 15 days — 74 days, which a flat 30.44-day month would call 2.43 months. The decimal figure is still shown for rough estimates.

When the start day does not exist in the later month, the month ends on that month's last day: a month from 31 January ends on 28 February, so 31 January to 1 March 2026 is 1 month 1 day.

What this calculator shows

Total days between the dates, with or without the end date
A calendar breakdown in years, months and days
The same span in weeks and days
Weekdays, Monday to Friday
Correct handling of leap years and uneven month lengths

What to keep in mind

By default the start date counts and the end date does not; “Include” counts both.
Calendar months are counted from the start date, with the remainder in days.
Weekdays are Monday to Friday; public holidays are not subtracted.

FAQs

Does the result include both the first and last day?

Not by default: it counts elapsed days, so 1 to 2 January is one day. Switch the end date to “Include” for a duration that counts both, such as leave from 1 to 14 July — 14 days.

How many working days is that?

The weekdays line counts Monday to Friday. It does not know your public holidays, so subtract those that fall inside the span.

Why can two spans of 'one month' differ in days?

Because months are unequal. 1 January to 1 February is 31 days; 1 April to 1 May is 30; 1 February to 1 March 2026 is 28. The calendar breakdown counts those real months.

Can I calculate a date in the past?

Yes. Put the earlier date second and the day count comes out negative; the calendar breakdown shows the same span.

How many days are there from 31 January to 1 March 2026?

29 days, or 1 month and 1 day on the calendar: a month from 31 January ends on 28 February, and 1 March is one day more. 20 of those days are weekdays.

How do I find the date a number of days away instead?

That is the reverse problem. The date calculator adds or subtracts days, weeks, months or working days and shows the date you land on.

Worked example

A quarter of the year

Input: 1 January to 1 April 2026, end date excluded

Output: 90 days, exactly 3 months, 64 weekdays

Note: In the leap year 2028 the same span is 91 days. The first quarter has 90 days in a common year and 91 in a leap year; the other quarters have 91 or 92.

Useful links

All tools in Date & Time World Clock Time Difference

Date Difference Calculator

Result

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