Date Difference Calculator
Calculate the exact difference between two dates — days, weeks, months, years, hours, minutes, and seconds.
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About Date Difference Calculator
Calculating the exact difference between two dates is more complex than it might seem — months have different lengths, leap years add an extra day every 4 years (with exceptions), and daylight saving time changes mean some days have 23 or 25 hours. This calculator handles all these edge cases correctly.
Common use cases include calculating age in years and days, measuring project duration, determining contract or subscription lengths, calculating deadlines, measuring time between events, and computing work hours between two timestamps.
FAQ
How are months calculated?
Months are calculated by comparing calendar months, not dividing days by 30. So the difference between January 31 and February 28 is exactly 1 month (or 28 days in a non-leap year). This matches how humans intuitively count months.
Does the calculator account for leap years?
Yes. The total days calculation uses the actual calendar, so it correctly counts 366 days for leap years. A year is a leap year if divisible by 4, except for century years which must be divisible by 400.