Key facts
- Counts the exact calendar days between two dates — leap years included automatically.
- Also shows the span in weeks and months for planning at a glance.
- 1 Jan 2026 → 31 Dec 2026 is 364 days — exactly 52 weeks.
- 1 Jan 2024 → 1 Jan 2025 is 366 days, because 2024 is a leap year.
How many days until the deadline, the holiday, the big birthday? This free date difference calculator finds the exact number of days between any two dates — using the real calendar, so leap years are counted correctly.
Pick a start and end date. You will see the total days plus the same span expressed in weeks and months, which makes project planning and countdowns much easier.
How to use
- Pick the start date.
- Pick the end date (it must be after the start).
- Read the total days between them.
- See the same span in weeks and months underneath.
How the count works
| Term | Meaning |
|---|---|
| Days | Exact number of midnights between the two dates. |
| Weeks | Total days ÷ 7, shown with any remainder. |
| Months | Calendar months spanned, for rough planning. |
The count is exclusive of the start date and inclusive of the end date — the standard “days between” convention. 1 Jan to 2 Jan is 1 day.
Worked examples
A full year
1 January 2026 → 31 December 2026: 364 days — exactly 52 weeks.
2026 is not a leap year, so February has 28 days and the year totals 365 days; the span shown excludes the start date itself.
Across a leap year
1 January 2024 → 1 January 2025: 366 days.
2024 is a leap year, so 29 February 2024 falls inside the span and adds one extra day. Forgetting leap years is the classic date-math mistake.
Handy durations
| Period | Length in days |
|---|---|
| 1 week | 7 |
| 1 month (average) | ≈ 30.44 |
| 1 quarter year | ≈ 91.3 |
| 1 common year | 365 |
| 1 leap year | 366 |
| 1 decade | 3,652 (with 2–3 leap days) |
Frequently asked questions
Does it count leap years?
Yes. The calculation walks the real calendar, so every 29 February inside your span is included.
Is the start date included in the count?
No — it counts the days between the dates. 1 Jan to 2 Jan is 1 day, the standard convention.
How many days are in a month on average?
365.25 ÷ 12 ≈ 30.44 days. But real months are 28–31 days, which is why the calculator uses the calendar, not an average.
Can I count backwards from today?
Set the start date to the earlier date and the end to today — the tool needs the end date after the start.
What about time zones and daylight saving?
Date differences use whole calendar days, so time zones and clock changes don’t affect the result.
Key takeaways
- Exact calendar days between two dates, leap years handled automatically.
- Weeks and months views make the same span useful for planning.
- “Days between” excludes the start date: 1 Jan → 2 Jan = 1 day.
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