Date Difference Calculator
A date calculator adds or subtracts days, weeks, months, or years from a date to find a resulting date. Useful for project deadlines, contract expiration dates, subscription renewals, legal deadlines, and age milestones.
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Tip: The "30/360" convention used in finance assumes all months have 30 days and years have 360 days. It simplifies interest calculations but differs slightly from actual elapsed days.
- 1Adding days: count forward from the start date
- 2Adding months: add to the month number, handle year rollovers and month-end edge cases
- 3Leap years: divisible by 4 (except centuries unless divisible by 400)
- 4Business day calculations exclude weekends (and optionally holidays)
Jan 15, 2024 + 90 days=April 14, 2024Common "net 90" payment term
March 31 + 1 month=April 30April has 30 days, so end-of-month
| Month | Days | Leap year? |
|---|---|---|
| January | 31 | Same |
| February | 28 | 29 in leap years |
| March | 31 | Same |
| April | 30 | Same |
| May | 31 | Same |
| June | 30 | Same |
| July–August | 31 each | Same |
| September, November | 30 each | Same |
| October, December | 31 each | Same |
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Fun Fact
The Gregorian calendar has 365.2425 days per year on average. This is achieved with the leap year rule: add a day every 4 years, except every 100 years, except every 400 years. The year 2000 was a leap year; 1900 was not.
References
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