Day Counter
Count the days between two dates — total days, weekdays vs. weekend days, full weeks, and a months-and-days breakdown. Toggle whether the end day counts, switch to business days only, or flip modes to add or subtract days (calendar or business) from a date.
Business days are Monday–Friday. Public holidays are not excluded — subtract any that fall in your range.
How days between dates are counted
The count is the number of calendar days from the start date up to — but not including — the end date, the same way ages and deadlines are normally figured. Tick include end day when both endpoints should count, e.g., a rental you occupy on both the first and last day. The weekday/weekend split walks the range day by day, so leap days and month lengths are always exact, and the business-day figure counts Mondays through Fridays only.
In add/subtract mode, business-day counting skips Saturdays and Sundays as it steps — the standard way contract and shipping deadlines like “90 business days” are computed.
How it’s calculated
Total days = end − start (in UTC day units) + 1 if the end day is included. Weeks = days ÷ 7 with remainder. Months = whole calendar months from the start date, then leftover days — so month length differences are respected. Hours = days × 24.
Business days exclude weekends only; U.S. federal holidays (11 per year) or your local holidays must be subtracted manually.
Worked example
From July 4, 2026 to December 25, 2026 is 174 days (175 if you include the end day): 124 weekdays and 50 weekend days, 24 weeks 6 days, or 5 months 21 days — 4,176 hours. In add mode, 90 calendar days after July 4, 2026 lands on Friday, October 2, 2026, while 90 business days stretches to Friday, November 6, 2026.
Common mistakes
- Counting both endpoints when only one should count — decide up front whether the end day is included.
- Treating business days as excluding holidays — here they exclude weekends only.
- Assuming a month is 30 days; the months line uses real calendar months (28–31 days).
- Adding business days by multiplying weeks × 5 — the weekday of the start date shifts the landing date.
Where it is used
- Counting down to a wedding, due date, trip, or product launch.
- Computing contract windows like “net 30” or “90 business days to closing.”
- Tracking days into a pregnancy, training plan, or streak.
- Project planning: converting a deadline into remaining working days.
Frequently asked questions
When should I include the end day?
Include it when the last day itself counts as a full day — hotel occupancy, medication courses, or billable rental days. Leave it off for “how many days until” countdowns: July 4 to July 5 is 1 day away.
Are holidays excluded from business days?
No — business days here mean Monday through Friday. The U.S. observes 11 federal holidays; subtract any that fall inside your range for a working-day count (or check your company and market calendar).
How does add-90-business-days work?
The counter steps forward one calendar day at a time and only counts Mondays–Fridays. From July 4, 2026, +90 business days lands on November 6, 2026 — 125 calendar days later.
Are leap years handled?
Yes. The math walks the real calendar, so February 29, 2028 counts as a day, and Feb 28 to Mar 1 is 2 days in a leap year but 1 day otherwise.
Why do the weeks and months lines disagree with ÷30?
Weeks divide the exact day count by 7. Months count true calendar months, which run 28–31 days — 174 days is 5 months 21 days here, not 174 ÷ 30 = “5.8 months.”