Days Between Dates
Count the number of days, and full weeks, between two dates — with an option to include the end date.
Formula last reviewed 15 September 2026 · How we verify our calculators
Days between
- Full weeks
- 8
- Remaining days
- 4
Updates live as you type
Frequently asked questions
Enter both dates and the calculator counts the calendar days from the start to the end. It also breaks the total into full weeks plus leftover days.
By default the end date is excluded, which measures the gap. Choose “Include end date” to count both endpoints — useful for billing or leave that covers the final day too.
Yes. The count spans February correctly, returning 60 days for 1 Jan to 1 Mar in a leap year and 59 in a normal year.
Yes. If the start is later than the end, the result is negative, indicating the end date is in the past relative to the start.
Sixty days, eight weeks and four days
From 1 January 2024 to 1 March 2024 is 60 days — 8 full weeks plus 4 days.
That total includes 29 February, because 2024 was a leap year. The identical span in 2025 is 59 days. Any calculation crossing the end of February needs to know which year it is in, which is the single most common source of manual error in date arithmetic.
How the count works
Days between = end date − start date
By default this counts the days that elapse between the two dates, excluding the start and including the end — the standard "difference" convention. The inclusive option adds one, counting both endpoints, which is what you want when counting days of attendance, hospitalisation, a leave period or a stay.
The distinction has real financial consequences. A hotel charging per night from 1 to 3 January bills two nights. An employer counting leave from 1 to 3 January deducts three days. Both are correct; they are counting different things.
The weeks and remaining days breakdown divides the total by seven: 60 ÷ 7 = 8 remainder 4.
Leap years, precisely
A year is a leap year if it is divisible by 4, except century years, unless those are divisible by 400.
So 2020 and 2024 were leap years. 1900 was not. 2000 was. The next century exception is 2100, which will not be. This rule exists because the Earth's orbit takes about 365.2422 days, and a plain four-year rule would over-correct by roughly three days every four centuries.
For most practical spans only the simple divisible-by-4 rule matters, but any calculation reaching across 1900 — genealogy, long-dated instruments, historical records — needs the full rule.
What this is used for
Interest and penalty calculations, where day-count conventions determine the amount owed.
Project planning — elapsed days between milestones, and the lag between dependent tasks.
Notice and limitation periods, confirming whether a deadline has passed.
Leave and attendance, where the inclusive count is almost always the right one.
Personal milestones — days married, days since a start date, days until an event.
Medical intervals, including gestational age and dosing schedules counted in days.
Day-count conventions
If you are calculating interest, note that finance does not always count actual days. Several conventions exist and they give different answers for the same two dates:
Actual/Actual — real days elapsed over the real year length. Used for government securities.
Actual/365 — real days over a fixed 365-day year. Common in Indian banking.
30/360 — every month treated as 30 days and every year as 360. Still used for some corporate bonds, and it makes 31 January to 28 February exactly 28 days rather than the actual 28.
This calculator counts actual elapsed days. If you are reconciling against a bank or bond calculation and find a small discrepancy, a differing convention is the usual explanation.
Common mistakes
Ignoring the inclusive question. One day of difference, every time, and it is the difference between a hotel bill and a leave deduction.
Forgetting the leap day. 60 days versus 59 for the same calendar span in different years.
Dividing days by 30 to get months. Months are not 30 days, and the error accumulates.
Mixing date formats. DD/MM and MM/DD produce silently wrong answers for any day under 13.
Assuming a year is 365 days for long spans. Across a decade, leap days add two or three.