Contracts, deadlines, pregnancies, notice periods — life runs on the gap between two dates. This calculator counts that gap exactly: pick a start and an end date and get the total days, the same span in whole weeks, the number of business days, and a years, months and days breakdown. An include-end-date toggle handles the two counting conventions that cause most off-by-one arguments.
Understanding the Numbers
The total is the full elapsed days between the dates. Business days exclude Saturdays and Sundays, which is the figure offices mean by a 10-business-day deadline. The breakdown re-expresses the span the calendar way — for example, 1 year, 2 months and 9 days — which rarely matches simply dividing by 30, because months have different lengths. The include-end-date option adds one day, used when both the first and last day should count, as in hotel stays and rental periods.
How to Count Days Between Dates
- Select the start date.
- Select the end date.
- Decide whether the end date itself should be included, and toggle it if needed.
- Read the total days, weeks, business days and the breakdown.
- Swap the dates if you need the span measured the other way.
Everyday Uses
Project managers count down to delivery dates. Tenants and landlords verify notice periods. Couples count days to a wedding or anniversary. Anyone tracking a 90-day probation, a warranty window or a subscription trial can check exactly how much time remains without counting calendar squares by hand.
Frequently Asked Questions
What is a business day here?
Monday to Friday, excluding weekends. Public holidays are not subtracted automatically because they differ by country — for holiday-aware counting, use the working days calculator.
Why do I get a different answer from another site?
Usually the end-date convention. Check whether the other tool includes the final day; toggling the option here matches either convention.
Can the end date be before the start date?
Yes. The calculator reports the span as a positive number of days between the two dates regardless of order.