How the days between dates are counted
By default the calculator counts the days from the start date up to the end date, which is how most people count durations ("from Monday to Friday is 4 days"). Tick Include the end date to count both days, for example when counting the days of an event or a hotel stay that includes the last day.
Calculations use calendar dates in UTC, so daylight saving time changes never add or remove an hour and throw the count off.
Business days count Monday through Friday only. Public holidays aren't removed, because they vary by country, state and employer. Subtract any holidays that fall in your range.
Adding months and years
When you add months to a date like January 31, the result is clamped to the last day of the target month: January 31 + 1 month = February 28 (or 29 in a leap year). This matches how most banks and contracts handle month-end dates.
Next steps
To count someone's exact age in years, months and days, use the age calculator. To see what time it is somewhere else on a date, use the time zone converter.
Frequently asked questions
How many days until Christmas?
The end date defaults to the next December 25, so the result shows the days until Christmas from today. Change either date to count to any other day.
Does this count weekends?
The main total counts every calendar day. The business-days row counts only Monday to Friday, and the weekend row shows the rest.
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