Date Difference Calculator
Count the days, weeks and months between two dates, or add and subtract days from a date.
Tip: The result counts calendar days. If you need only working days, use the working days calculator instead.
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About this digital tool
A date difference calculator shows how many days, weeks, months and years lie between two dates. Pick a start date and an end date, and the result appears straight away, together with the day of the week for each date. The tool also has a tab for adding or subtracting days from a date. It is useful for contract deadlines, probation periods, payment schedules, leave days and project timelines. The difference follows the real calendar, so months of 28 to 31 days and leap years are taken into account. If you need only working days without weekends and public holidays, use the working days calculator. For legal deadlines, always check how the relevant document defines counting.
How to use
- Pick the start date.
- Pick the end date.
- Read the difference in days, weeks and months.
Frequently asked questions
Is the last day included in the count?
The calculator returns the number of days between the two dates. If you need an inclusive count that also includes the final day, add 1.
How are the days between two dates counted?
The calculator takes the calendar difference between the start and end dates. For example, from 1 January to 31 January is 30 days.
Can I add or subtract days from a date?
Yes. Use the add/subtract tab, choose a starting date and the number of days, and the result shows the new date and its day of the week.
How do I count only working days?
Use the working days calculator for a count that excludes weekends and holidays. This tool counts every calendar day.