Days Between Dates Calculator
Enter two dates to get the exact number of days, weeks, business days, and hours between them — in either order, with optional inclusive counting.
Copied to clipboard.
About this days-between-dates calculator
This tool answers a question that shows up in very different situations: how many days sit between two points on the calendar. A project manager wants to know how many working days are left before a deadline. Someone planning a trip wants total days away, weekends included. A landlord calculating a prorated rent needs the exact day count of a partial month. Each of these wants a slightly different number from the same two dates, so this calculator gives you all of them at once instead of forcing you to pick one definition up front.
By default, the count is exclusive — the way you would answer "how many days until Friday" on a Monday: four, not five. Tick "count both the start and end date" and the tool switches to inclusive counting, adding one day, which is what you want for questions like "how many days was I in hospital" where both the admission day and the discharge day count as days you were there. The business-day figure follows whichever mode you have selected, so a Monday-to-Friday inclusive range correctly reports five business days, not four.
Business days are counted by walking the calendar and marking Saturdays and Sundays as non-working, which is the standard five-day work-week definition used across most of the world. It does not currently account for public holidays, since those vary enormously by country and even by state or industry — if your use case needs holiday-aware counting for a specific region, treat the business-day figure here as the weekday count and subtract known holidays manually.
You do not need to know which date comes first. Enter your two dates in either order and the calculator sorts them out, showing you which one it treated as the earlier date in the result. This matters for a tool used for both past-dated questions ("how many days has it been since...") and future-dated ones ("how many days until...") without needing two separate pages.
Alongside the day count, you get the same span expressed as weeks and remaining days, and as total hours — useful for anyone working with SLAs, shipping windows, or any timeframe where hours matter more than days. Nothing you enter leaves your browser; the entire calculation runs locally in JavaScript.
Frequently asked questions
Does this count include both dates or just the difference?
By default it excludes the start date and counts up to the end date — the standard subtraction most calendars use. Check "count both the start and end date" if you need both endpoints included, which adds one day to every figure.
What counts as a business day here?
Monday through Friday. Public holidays are not excluded automatically, since holiday calendars vary by country. Treat the business-day total as a weekday count and subtract holidays specific to your region if needed.
Does it matter which date I enter as "start" and which as "end"?
No. Enter them in either order and the calculator automatically treats the earlier one as the start of the range, showing you the order it used in the result.
How is the "total hours" figure calculated?
It's the total day count (using whichever inclusive/exclusive setting you've chosen) multiplied by 24. It does not account for specific start and end times, only full calendar days.
Can I use this for pregnancy weeks, rental periods, or loan terms?
Yes — any situation needing the day or week span between two calendar dates works. For pregnancy dating in particular, remember clinical due-date conventions typically count from the first day of the last period, not conception.