Days Calculator
Count the days until a future date, the days since a past one, or the days between any two dates — with a business-days-only option and a clean weeks breakdown.
A full calendar year — Wednesday, 1 January 2025 to Wednesday, 31 December 2025 — is 364 days, or 52 weeks and 0 days.
364 days
A full calendar year, Wednesday, 1 January 2025 to Wednesday, 31 December 2025 (52 weeks)
3 modes
Days until a future date, days since a past date, or days between two dates
5 of 7
A standard week is 5 business days and 2 weekend days — toggle to count either
One number, three ways to ask for it
Built for a single, clear day count — not a wall of date math.
Days until
Count down to a holiday, deadline, birthday, or due date. If the date has already passed, the calculator switches to telling you how long ago it was.
Days since
Count up from an anniversary, a start date, or any past event to see exactly how many days have gone by.
Days between & business days
Measure the gap between any two dates, switch to business-days-only to skip weekends, and read the result in weeks as well as days.
How the Days Calculator Works
Formula
spanDays = (later date − earlier date) + (include final day ? 1 : 0)
businessDays = weekdays (Mon–Fri) within the span
weekendDays = Saturdays + Sundays within the span
totalDays = business-days-only ? businessDays : spanDays
weeks = spanDays ÷ 7 (shown as whole weeks + leftover days)Choose a mode
Days until, days since, or days between.
Enter the date(s)
One date for until/since, two for between.
Pick weekends or not
Optionally count business days only.
Inclusive or exclusive
Include the final day for an inclusive count.
Read the count
Days, business days, and a weeks breakdown.
The calculator orders your two dates automatically, so it never returns a negative number — if a target date is already in the past, it simply tells you how many days ago it was. Counts use the Gregorian calendar in UTC, so daylight-saving changes never shift the result by a day.
Business-day counting excludes Saturdays and Sundays but not public holidays, which differ by country and region. For payroll cut-offs or legal deadlines, always confirm the count against the holiday calendar that applies to you.
Frequently Asked Questions
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