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Days Between Dates Calculator

Calculate how many days, weeks, months and working days there are between two dates.

Calculating the exact number of days between two dates is a common need in legal, work and personal contexts: deadlines for administrative appeals, duration of temporary contracts, holidays used or time until an event. The distinction between 'calendar days' and 'working days' (excluding weekends) is key in many of these contexts.

This calculator gives you in one click the total days, weeks, approximate months and working days between two dates. Useful for calculating legal deadlines, duration of sick leave, probationary periods in employment contracts or simply knowing how long it is until a holiday or special event.

Start Date

End Date

Include end date in calculationCalculate workdays only (Mon–Fri)

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Today's Progress

It's day 205 of 2026. You've already completed 56% of the year!

TOTAL DURATION

0days

Breakdown

0m, 0w, 0d

Months, weeks, and remaining days.

Productivity

0 business days

Business days excluding weekends.

Common Intervals

Probationary Period

Calculate when a typical 6-month employment probationary period ends.

Project Deadline

Set realistic deadlines by counting 30 working days from today.

Academic Semester

Track the number of weeks remaining before final exams or end of semester.

Working days exclude weekends but not local or national public holidays, which vary by region. For exact legal deadlines, consult the official calendar.

How the days between two dates are calculated

Calculating the days between two dates means subtracting the start date from the end date and counting the number of calendar days elapsed. From that total you derive the weeks (dividing by 7), the approximate months and the working days, which exclude weekends.

This calculator works out that difference automatically when you enter both dates and shows the result in days, weeks, months and working days, with no need to count by hand on the calendar.

Example

Between 1 and 15 January there are 14 calendar days (2 weeks) and, excluding one weekend, around 10 working days. If you need to include the start day itself, enable the 'Include end date' option or add 1 to the total.

Calendar days versus working days

The distinction is fundamental and causes many errors in paperwork and contracts. Calendar days are all days on the calendar, including Saturdays, Sundays and public holidays: this is the criterion used for employment notice periods, holidays and most civil contracts. Working days exclude weekends and official public holidays, and are the reference in administrative and judicial procedures. There is also the category of business days, which in the private sector usually matches working days but can vary by collective agreement. Faced with any deadline, the first step is to identify which of the three criteria applies, because the difference between them can exceed 30% of the total.

Worked example

From 1 January 2024 to 1 March 2024 there are 60 calendar days: 31 in January plus 29 in February, since 2024 was a leap year. Had the year been 2023, not a leap year, the result would be 59 days. In working days, that same 2024 interval contains approximately 43 days once weekends are deducted. The difference between the two criteria, about 17 days, is precisely why you should always check which type of day the document or rule you are working with requires.

Common administrative deadlines in Spain

Procedure	Deadline
Dismissal claim	20 working days
Administrative appeal	1 month
Higher administrative appeal	1 month
Hearing / submissions	10–15 working days
Judicial review	2 months
Unemployment benefit claim	15 working days

How to interpret the result

Before using the number obtained, check two things. The first is whether your deadline counts calendar or working days, because the calculator offers both and choosing the wrong criterion can cost you a right. The second is whether the endpoints are included: in most legal deadlines counting begins the day after the triggering event, so the starting day does not count. Bear in mind too that the working-day calculation cannot account for local and regional public holidays, which vary by municipality, so for tight deadlines it is worth checking against your region's official calendar.

Frequently asked questions

By default, the calculation uses the strict difference between the two dates: if the start and end are the same day, the result is 0. Enable 'Include end date' to also count the last day. For a stay from 1 to 7 January, without inclusion it is 6 days; including the end, it is 7.

Saturdays and Sundays are excluded, but not local or national public holidays, which vary by region and municipality. If you need the exact count including public holidays—for a contract, sick leave or an administrative deadline—consult the official labour calendar for your province.

This calculation is useful in many situations: finding out how many days are left until an event, checking whether a legal deadline has passed (administrative appeals usually allow 15 or 30 working days), calculating the probationary period of a contract, estimating the time between two project milestones, or verifying how many holiday days have elapsed.

A year is a leap year if it is divisible by 4, unless it is divisible by 100, in which case it only qualifies if it is also divisible by 400. That is why 2000 was a leap year but 1900 was not, and 2100 will not be either. This rule exists because the Earth takes about 365.2422 days to orbit the Sun, slightly less than 365 and a quarter days, so adding a day every four years slightly overcorrects the drift. The calculator applies this rule automatically, so intervals crossing a 29 February include that extra day without you having to do anything.

It depends on whether the deadline is expressed in days, months or years. Law 39/2015 establishes that deadlines set in days are counted in working days, excluding Saturdays, Sundays and public holidays, unless the rule expressly states they are calendar days. Deadlines in months or years are computed date to date: a one-month deadline starting on 15 March expires on 15 April. Counting starts the day after notification, not the same day, and if the last day is non-working the deadline extends to the next working day.