Date Calculator
Free date calculator. Work out the days between two dates, including working days, or add and subtract days, weeks, months and years from any date.
Days between two dates
Add or subtract from a date
What it does
Two questions with the same machinery behind them: how far apart are two dates, and what date lands a given distance from another. Both are harder than they look, because months have different lengths and because a day is not always twenty-four hours — clocks move forward and back. This page counts calendar days with whole numbers, so daylight saving never shifts the answer.
How to use it
- For an interval, type both dates. The order does not matter.
- For a future or past date, type the starting date and how much to add or subtract.
- Read the total, and the same interval broken into years, months and days.
The arithmetic runs in your browser. Nothing you type is sent anywhere and nothing is stored, so you can use these with real numbers.
Frequently asked questions
Are working days Monday to Friday?
Yes. Public holidays are not deducted, because they differ in every country and in many countries by region, so a single number would be wrong almost everywhere.
Is the first day counted?
No. The count is the number of days you have to move forward to reach the end date, so 1 to 2 January is one day. If you need both endpoints included — the way hotel nights or rental days are often billed — add one.
What does adding a month to 31 January give?
28 February, or 29 in a leap year. There is no 31st in February, so the day is clipped to the end of the month. That is what spreadsheets and databases do too.
Does daylight saving affect the result?
No. Counting in hours would break on the days that have 23 or 25 hours. This page counts whole calendar days, so the result is the same everywhere in the world.
Wikipedia — Gregorian calendar
Wikipedia — Business day
Wikipedia — Leap year
Wikipedia — ISO 8601