Days Between Dates Calculator
This calculator finds exactly how far apart two dates are, in whichever unit is useful: total days, weeks and leftover days, or a calendar-style “years, months and days” breakdown. It also names the weekday each date falls on and counts the weekdays (Monday–Friday) in between. Enter the dates in either order; the result is always the same.
How to use the days between dates calculator
- Enter the first date and the second date.
- Read the total days first, then the weeks-and-days or calendar-span breakdown, whichever matches how you want to describe the gap.
- Check which date is earlier if you are not sure, and use the weekday rows to see what day each one falls on.
Formula
Total days is the plain difference between the two dates on the calendar (leap days are counted automatically, since every real February is included). The calendar span instead counts whole years, then whole months, then the days left over — the way people naturally describe an age or a gap (“2 years and 3 months”, not “823 days”).
Worked examples
A full calendar year
1 January 2026 to 31 December 2026 is 364 days apart (not 365, since going from the 1st to the 31st of the same year is one day short of a full year). That is 52 weeks and 0 days, and 261 of those days are weekdays.
Spanning a leap day
28 February 2024 to 1 March 2024 is 2 days apart, because 2024 is a leap year and includes 29 February. The same two calendar dates in 2026 (not a leap year) are only 1 day apart.
A long span
15 May 1990 to 26 September 2026 is 13,283 days — a calendar span of 36 years, 4 months and 11 days, and 1990-05-15 falls on a Tuesday while 2026-09-26 falls on a Saturday.
Counting days the way people actually mean it
“Inclusive” or “exclusive”?
There are two ways to answer “how many days between X and Y”: the plain subtraction (this tool’s “total days”), and an inclusive count that adds 1 to include both endpoints (used when counting things like hotel-night stays or event durations, where the first and last day both count as a day). This calculator reports the plain subtraction, since that is what “time elapsed” usually means; the business days calculator uses an inclusive convention instead, since that better matches how working days are usually counted.
Everyday uses
| Situation | What to read |
|---|---|
| How long ago something happened | Total days, or the calendar span |
| Planning a trip or deadline | Weeks and days |
| Describing someone’s age or a relationship length | Calendar span (years, months, days) |
| Estimating working time available | Weekdays in range (or the business days calculator, for holidays too) |
Why leap years matter here
Any span that includes a 29 February is one day longer than the same calendar dates in a non-leap year. This trips up manual calculations more than almost anything else in date arithmetic, and it is exactly the kind of thing worth double-checking with a calculator rather than counting by hand.
Practice problems
Try these yourself first, then check your answer. The answers come from the calculator above.
- How many days are between 25 November 2026 and 25 December 2026?
Show answer
Total days: 30
- How many days are between 1 January 2000 and 1 October 2026?
Show answer
Total days: 9770
Common mistakes to avoid
- Assuming “1 January to 31 December” is a full 365 days — it is 364, one short of a year, because both dates are inside the same calendar year.
- Forgetting leap years when counting by hand; every 29 February adds one extra day to any span that crosses it.
- Mixing up “total days” with “calendar span”. 400 total days is also 1 year and about 35 days — both describe the same gap.
Frequently asked questions
How do I calculate the number of days between two dates?
Enter both dates and read the “Total days” row. It counts every calendar day between them, including any leap days.
Does it matter which date I enter first?
No. The tool works out which date is earlier and reports the same total either way.
Why is 1 Jan to 31 Dec not 365 days?
Because both dates fall in the same year, the gap between them is one day short of a full year: 364 days.
How do I exclude weekends or holidays?
Use the business days calculator, which lets you enter holiday dates to exclude as well.
Reviewed September 26, 2026 by the SolveCalcPro editorial team. Found a mistake? Tell us; see our editorial policy.