Date Difference Calculator
Find the exact number of days, weeks, months, and years between two dates.
Did this tool work for you?
How to use this calculator
Calculates the calendar distance between two dates in multiple units simultaneously.
- 1
Enter the start date using the first date picker.
- 2
Enter the end date using the second date picker.
- 3
The exact difference appears in years, months, days, and total days simultaneously.
Frequently asked questions
Does it matter which date I put first?
The size of the gap is the same either way, but the display changes. If the end date is earlier than the start date, the headline reads “End is before start”, total days carries a minus sign (December 25 back to January 1, 2026 shows −358), and the weeks and months lines show the gap as positive numbers without a sign.
Does the count include both the start and the end date?
No. It measures the distance between the two dates, so March 15 to March 15 is 0 days and Monday to Tuesday is 1. If your contract, leave request or booking counts both end dates, add 1 to the total days.
How are the months and days split when the start date is the 29th, 30th or 31st?
Whole months are counted forward from the start date, and when the target month is too short the date is pulled back to its last day. January 31 plus one month is February 28, so January 31 to March 1, 2026 reads 1 month and 1 day (29 days in total) rather than something with negative days. Other calculators may use a different convention for these cases and show a one-day difference.
What does “Total months (approx)” actually show?
Complete calendar months only: years × 12 plus the months in the breakdown. Leftover days are dropped, not rounded. From 2024-01-01 to 2026-11-03 it shows 34, even though there are 2 more days on top.
How does it treat a start date of February 29?
The anniversary in a common year is taken to be February 28. From 2024-02-29 to 2025-02-28 the result is exactly 1 year, 0 months, 0 days, and the total is 365 days.
Does it work with times, time zones or daylight saving?
It compares calendar dates only, each taken as local midnight, so there is no time of day and no hour count. Clock changes cannot shift the result by a day because the elapsed time is rounded to whole days.
Can I skip weekends or holidays?
No, every calendar day is counted. For a weekday-only count between two dates use the working days calculator, and subtract any public holidays yourself because neither tool has a holiday list.
Date difference calculator — days, weeks, months and years between two dates
Total days versus years, months and days
A gap between two dates can be stated as one count of days or as a calendar breakdown, and each answers a different question. Total days is unambiguous, which is why interest accrual, notice periods and day-count clauses use it. The years-months-days form is how people describe elapsed time out loud. The calculator reports both, plus the total as weeks and leftover days, so you can copy whichever figure your document asks for. A clause that says “within 90 days” wants the total; a card for someone’s anniversary wants the breakdown. Neither is more correct, they simply answer different questions about the same span.
Worked examples
These four spans were run through the calculator with fixed dates.
| Start | End | Breakdown | Total days |
|---|---|---|---|
| 2024-01-01 | 2026-11-03 | 2 yr, 10 mo, 2 days | 1,037 (148 weeks, 1 day) |
| 2026-01-31 | 2026-03-01 | 1 mo, 1 day | 29 |
| 2024-02-29 | 2025-02-28 | 1 yr, 0 mo, 0 days | 365 |
| 2026-12-25 | 2026-01-01 | End is before start | −358 |
How months are counted at month-end
Whole months are counted forward from the start date, and when the target month is too short the date is pulled back to that month’s last day. January 31 plus one month lands on February 28, so January 31 to March 1, 2026 is one month and one day, not zero months and 29 days. A leap-day start behaves the same way: the first anniversary of February 29, 2024 in a common year is February 28, 2025, which is why that span shows exactly one year and 365 days.
Inclusive versus exclusive counting
The tool counts the distance between dates, so the same date twice gives 0 days and Monday to Tuesday gives 1. Leave requests and rental periods often count both end dates, and then you add one to the total. Hotel stays are the usual exception, where the exclusive figure is the number of nights. Settle which convention your document uses before quoting a number, because the two differ by exactly one day.
What it leaves out
Only calendar dates are compared, with no time of day or time zone, and every day counts: weekends and public holidays are not removed. If the end date is earlier than the start date, the headline says so and the total days carries a minus sign, while the weeks and months lines show the size of the gap without one. A quick sanity check is to add the total days back onto the start date with the date calculator, which should land exactly on the end date.
Learn more from an authoritative source:
WikipediaTime Calculator
Add or subtract two time values in hours, minutes, and seconds.
Working Days Calculator
Count the number of working days (Monday–Friday) between two dates, excluding weekends.
Business Days Calculator
Calculate a future or past date by adding or subtracting a number of business days (Mon–Fri).
Birthday Calculator
Discover your age, the day you were born, days until your next birthday, and your zodiac sign.
Retirement Calculator
Find out when you can retire based on your date of birth and target retirement age.
Day of Week Calculator
Find the day of the week, week number, and day of year for any date.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →