Days Between Dates Calculator
Count the days, business days, or weeks between any two dates.
There are 0 days between 2026-06-12 and 2026-06-12. That's 0 days when broken down into years, months, weeks, and days. Negative values mean the end date comes before the start date.
How do you count days between two dates?
Subtract the start date from the end date. DateSolver does this for you and returns the exact total, plus a year/month/week/day breakdown.
Does the count include weekends?
Yes by default. Turn on business-days mode to skip Saturdays and Sundays, or use the dedicated Business Days Calculator to also exclude US federal holidays.
What if my end date is before my start date?
The result becomes negative, but the absolute value is still correct.
Common spans
| Span | Days |
|---|---|
| 1 week | 7 |
| 2 weeks | 14 |
| 1 month (avg) | 30 |
| 1 quarter | 91 |
| 6 months | 182 |
| 1 year | 365 |
| 1 leap year | 366 |
| 5 years | 1826 |
| 10 years | 3653 |
A worked example
From January 15, 2026 to April 30, 2026 is 105 calendar days. Strip weekends and you get 75 business days — exactly 15 work weeks. Add US federal holidays (Presidents' Day, Memorial Day weekend depending on the window) and you'd lose another day or two. That gap between "days," "business days," and "working days excluding holidays" is where most planning mistakes happen. The toggle above handles all three.
Common spans, side by side
| Span | Calendar days | Business days (approx) |
|---|---|---|
| 1 week | 7 | 5 |
| 2 weeks | 14 | 10 |
| 1 month | ~30 | ~22 |
| Quarter | ~91 | ~65 |
| Half-year | ~182 | ~130 |
| 1 year | 365 | ~260 |
Where people actually use this
Counting days between two dates is one of the most boring-sounding tasks that turns out to matter constantly. Lawyers count days to a filing deadline; landlords count days to a lease end; HR counts days for probation periods, notice periods, and PTO accruals. Project managers count days to a launch. Travelers count days a passport must remain valid after a return flight — most countries want six months or 180 days. Pregnant people and clinicians count gestational age in weeks and days from a last menstrual period.
On the personal side: counting days since a quit date, days married, days until a wedding, days into a fitness program, days a child has been alive. The math is trivial; getting it exactly right when months and leap years are involved is not. Pair this tool with holiday countdowns if you want to anchor a span to a major calendar event.
The "include the end date" question
It depends on the rule you're following. US federal procedure usually excludes the start date and includes the end date. Most rental and contract clauses include both endpoints. SAT and certain visa rules are written either way and you have to read carefully. The toggle above lets you flip between conventions without redoing your math. When in doubt, count both — it's the more conservative choice and rarely puts you offside.
Frequently asked questions
Does it count the start date or only the end?
By default the result is the number of full days between the two dates, which excludes the start date. Toggle 'count end date' to include it.
What is 'business days only'?
It excludes Saturdays and Sundays from the count, leaving Monday through Friday. For a working-day count that also skips US federal holidays, use the dedicated Business Days Calculator.
Can I count days into the past?
Yes. If the start date is after the end date, the result becomes negative.
How accurate is the result across timezones?
All math runs in your local timezone. Daylight saving transitions don't change the day count.
How is this different from the age calculator?
Same math, different framing. The age calculator assumes the start date is a birth date and the end date is today. This calculator lets you compare any two dates.
Can I get the result in weeks or months only?
The breakdown line under the ticket shows years, months, weeks, and days. Read off whichever unit you need; the totals are equivalent expressions of the same span.