Practical guide 3 min read
How to count business days between two dates
Count working days with the right weekends, public holidays and days off, and avoid the classic off-by-one mistake.
Live
Utility
Date Calculator
Count calendar and working days, add or subtract dates, calculate age, and turn work hours into decimal time.
Your time, clearly
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Choose your options to begin.
Excluded holidays and custom dates
How this calculation works
Calendar days are counted from the start date up to the end date, so the start is included and the end isn't unless you tick “Include the end date”. The same span is also shown as weeks and days, and as whole calendar months and days.
Worked examples
- From January 15 to April 1, 2026 is 76 days: 10 weeks and 6 days, or 2 months and 17 days. Tick “Include the end date” and it becomes 77.
- The same range has 54 weekdays. The Business Days Calculator also takes out the public holidays of the calendar you choose.
Questions
Does the count include the start and end dates?
The start date is counted and the end date isn't, which is how “days until” is usually counted: Monday to Tuesday is one day. Tick “Include the end date” to count both, for the length of a stay or a leave.
How are months counted?
In whole calendar months from the start date, then the days left over. January 15 to March 15 is 2 months, whatever the month lengths, and a month from the 31st ends on the last day of a shorter month.
Can I enter the dates in either order?
Yes. If the start date is later, the two are swapped and counted forwards, and the result says the dates were reordered.
About
Six date and time calculators in one place: compare dates, count business days, add or subtract dates, calculate age, build a work-hours timesheet and convert decimal hours. Everything runs locally in your browser.
How it works
Choose a calculator, enter your dates or times, and see results immediately. Business-day calculations support custom weekdays, regional holiday presets, observed dates and extra days off. Timesheets support overnight shifts, unpaid breaks, rounding and CSV exports.
Notes
Holiday calendars are planning estimates. Workplace holiday and substitution rules can differ. Date-only calculations use calendar days without daylight-saving shifts; work hours are clock hours without time-zone adjustments.
Updates
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Provincial holidays
Added holidays for every Canadian province and territory.
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First release
A little guidance