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Date Difference
Count the days, weeks and months between any two dates.
Pick two dates — the end date must be after the start date.
Formula
Difference = later date − earlier date, expressible in days, weeks, months or years
How to calculate
- 1Enter the start date and the end date.
- 2Subtract to get the total number of days between them.
- 3Divide by 7 for weeks; use calendar math for months and years.
- 4Add or subtract days with the offset mode to find target dates.
How to use this calculator
- 1Enter both dates — order does not matter.
- 2See the difference in days, weeks, months and years at once.
- 3Include the end date if you want inclusive counting.
- 4Use the add/subtract mode to land on a future deadline.
Examples
Project deadline
From September 23 to December 15 is 83 days — about 11 weeks and 6 days of runway.
Countdown
From today to June 1 next year tells you exactly how many days remain to plan.
Common questions
Are weekends and holidays excluded?
No — the difference counts every calendar day. For business days, apply your own weekday filter on top of the total.
Does it handle leap years?
Yes — February 29 is counted whenever it falls inside the range, so multi-year spans are exact.
What about time zones?
The calculator works in calendar days; a range crossing time zones is interpreted in your local date.
