A date difference calculator counts the time between two calendar dates. It is helpful for project timelines, event planning, and deadline tracking.
How to use this calculator
- Enter the start date (year, month, day).
- Enter the end date (year, month, day).
- Review the number of days and full weeks between the dates.
Formula
The calculator converts both dates to timestamps and computes the difference in days. Weeks are the number of complete 7-day periods within that difference.
Example
From January 1, 2024 to June 15, 2025 is 540 days, or 77 full weeks.
Frequently asked questions
- Does the order of dates matter?
- If the end date is before the start date, the result will be negative. Enter the earlier date as the start date for a positive count.
- Are leap years included?
- Yes. The calculation uses standard calendar date arithmetic, which accounts for leap years.