Calculator
Date difference calculator
Compare the duration between two dates in calendar days, weeks and approximate months.
Inputs
Date difference calculator
Compare two dates in plain calendar terms so teams can reason about duration before adding country-specific working-day rules.
Data from Calendar arithmetic ยท last checked 2026-04-04.
This tool measures raw calendar duration only. Use a working-days calculator when weekends and public holidays matter.
Days
90
Plain calendar duration between the two dates.
Weeks
12.9
Approx. months
3.0
How it works
The tool compares two calendar dates without applying country-specific holidays. It is the cleanest starting point when you need to reason about duration before moving into business-day rules.
Example use case
Compare a contract term, notice period or project window in plain calendar terms first, then continue into the working-day tools if operational capacity matters.
Frequently asked questions
Short answers to the questions people most often ask before relying on the page.
- How are working days calculated?
- Working days are calculated by removing weekends and the selected country holiday calendar from the date range.
- Why can the same period differ by country?
- The same dates can produce different totals because each country follows its own public holiday calendar.
- When should I use the business days calculator?
- Use it when you need to add or subtract a fixed number of usable workdays from a start date.
- When should I use the between-dates or date-difference tools?
- Use between-dates for country-specific workday totals and date difference for raw calendar duration.