Does the count include the start date?
Not by default. The usual answer is the days that pass: 1 January to 8 January is 7 days. Choose "count both dates" to get 8, for example the days of a festival, or "count neither" to get 6 days in between.
Days Between Dates Calculator
How many days, weeks, months and working days lie between two dates.
Your answer
Days between your dates
Pick two dates and the days and weeks between them appear here, counted the way you choose: with or without the first and last day.
The working
Days = end date − start date
Count the days left in the first month, add every whole month, then the days in the last month. Counting both dates adds one; counting neither takes one off.
| Month | Days counted | Working days |
|---|---|---|
| Nov 2026 | 28 | 20 |
| Dec 2026 | 31 | 23 |
| Total | 59 | 43 |
Worked examples
- 1 January to 8 January 2026: 8 − 1 = 7 days pass. Counting both dates, 8.
- 1 March 2027 to 1 March 2028: 366 days, not 365, because 29 February 2028 is in between.
- December 2026, counting both ends, Saturday and Sunday off, Christmas Day (a Friday) as a holiday: 22 working days out of 31.
Good to know
Getting the count right
- Days that pass vs days on the calendar. A Monday-to-Friday trip is 4 nights but 5 days. Hotels count nights (days that pass); events and leave forms often count both dates.
- Off by one is the usual mistake. Before you send a date to anyone, check whether they count the first day.
- Deadlines. “Within 30 days” usually means 30 days pass, but courts, contracts and tax offices can have their own rules. Check the wording.
- Working days. Weekends differ around the world (Friday and Saturday in many Gulf countries), so pick yours.
- Months aren't equal. “3 months” can be 89 to 92 days, so give a date when it matters.
Questions
Questions people ask about counting days
How many days are left in the year?
Use today as the start date and 31 December as the end; the calculator opens that way. From 1 October to 31 December is 91 days.
How many months are between two dates?
Count whole months from the start date, then the days left over. 15 January 2026 to 3 June 2026 is 4 months (to 15 May) and 19 days. As a decimal it is 139 days ÷ 30.44, the average month, = 4.57 months. The Months tab gives both.
What date is one month after 31 January?
The last day of February: 28 February 2027, or 29 February 2028 in a leap year. When the next month is too short for the same day number, the date moves to that month's last day. Spreadsheets do the same with EDATE.
Do leap years change the answer?
Yes, by one day when 29 February is inside the range. 1 March 2027 to 1 March 2028 is 366 days, because 2028 is a leap year.
How are working days counted?
Weekend days are skipped, plus any holidays you type in. December 2026, counting both 1 and 31 December, has 23 weekdays; take out Christmas Day (a Friday) and 22 working days are left.
Do time zones or daylight saving change the count?
No. Only calendar dates are compared, so a 23-hour or 25-hour day around a clock change still counts as one day.
What if the end date is before the start date?
The calculator still counts the days and says the end date comes first. Use the swap key to put them the right way round.
Print room
Three one-page sheets, or the dates in Excel
The date range with its calendar for a file or a deadline; a countdown chart to tick off one box a day; or a leave request with the working days already counted. The Excel file keeps your dates and holidays in cells, with every count as a live formula.
For spreadsheets and code
Check the count yourself
from datetime import date, timedelta
start = date.fromisoformat("2026-11-02")
end = date.fromisoformat("2026-12-31")
days = (end - start).days
weekend = {5, 6} # Monday = 0
holidays = {}
first = start + timedelta(1)
work = sum(1 for i in range(days) if (d := first + timedelta(i)).weekday() not in weekend and d not in holidays)
print(days, work)Both print 59 43 (days, then working days) for your current dates.
Date range
For: ______________________ Date: 2 November 2026
| Start | Monday 2 November 2026 | End | Thursday 31 December 2026 |
|---|---|---|---|
| Days | 59: days that pass | Weeks | 8 weeks 3 days |
| Calendar | 1 mo 29 d | Working days | 43 (off: Saturday and Sunday) |
| Holidays skipped | none entered | ||
| Month | Nov 2026 | Dec 2026 |
|---|---|---|
| Days | 28 | 31 |
| Working | 20 | 23 |
Notes: ____________________________________________________________
Calendar dates only; holidays are the ones entered. calculationtime.com/calculators/days-between-dates-calculator/ · printed 2 November 2026
Sources
Where the calendar rules come from
- NIST: time and frequency division
- Unicode CLDR: dates and calendars
- ECMAScript: date and time values
- MDN: Intl.DateTimeFormat
- IANA time zone database
- NASA Space Place: why we have leap years
If the answer becomes a schedule, the date and time calculators cover working days, adding dates, durations, week numbers and time zones without changing the calendar basis.
Printables
