Business Days Between Dates Calculator
Enter two dates for the calendar days, the business days, the weekend days and every Ontario public holiday in the span.
Written and reviewed by Sharad Gondaliya, CPA (Ontario), CPA Ontario Membership 61040184.
Last reviewed: October 29, 2026
Enter both dates and the counts appear here.
Gondaliya CPA Professional Corporation is a registered EFILE electronic filer. Returns are prepared and transmitted in Canada. Credentials are never shared and never used offshore.
Calendar Days and Business Days Answer Different Questions
A deadline runs on calendar days. The work of meeting it runs on business days, and on a short span the two differ by enough to change a decision: ten calendar days over a long weekend is six business days.
A demand to file is where this bites hardest, because the letter names a date that may be close. The CRA demand to file deadline calculator does both counts against a letter.
The Nine Holidays, and Whose They Are
The calendar here is Ontario’s nine public holidays under the Employment Standards Act: New Year’s Day, Family Day, Good Friday, Victoria Day, Canada Day, Labour Day, Thanksgiving Day, Christmas Day and Boxing Day.
Good Friday moves every year because it is derived from Easter, and Family Day, Victoria Day, Labour Day and Thanksgiving Day are each defined by a weekday rather than a date. The calculator works all of them out rather than reading them from a table, so no year is missing.
| Public holiday | How the date is set |
|---|---|
| New Year’s Day | January 1 |
| Family Day | The third Monday in February |
| Good Friday | Two days before Easter Sunday, so it moves each year |
| Victoria Day | The Monday on or before May 24 |
| Canada Day | July 1 |
| Labour Day | The first Monday in September |
| Thanksgiving Day | The second Monday in October |
| Christmas Day | December 25 |
| Boxing Day | December 26 |
Every Date Tool Here Runs on This Calendar
This matters more than it sounds. A site with forty date tools can easily end up with two holiday lists and two answers for the same date, and a visitor who notices has no way to tell which one to trust.
There is one list, in one shared module, and every tool calls it. The due date weekend and holiday shift calculator shows the shift a single date gets from it.
A Holiday on a Weekend Is Counted Once
Where a public holiday falls on a Saturday or a Sunday, this counts it as a weekend day and not again as a holiday. That keeps the three counts adding up to the calendar total, which is the property that makes them checkable.
It also means such a holiday does not appear in the list of named holidays below the counts. The list is the holidays that cost a business day, not every holiday in the span.
Frequently Asked Questions
How many business days are between two dates?
Enter both and the calculator counts them. Both dates are included, so a Monday to the following Monday is eight calendar days.
Which holidays does this use?
Ontario’s nine public holidays under the Employment Standards Act. It is the same calendar every date tool on this site runs on.
Are both dates counted?
Yes. The span is inclusive at both ends, which is how a filing period is normally read.
What about a holiday that falls on a weekend?
It is counted once, as a weekend day, so the three counts still add up to the calendar total. It is not listed among the named holidays.
Does this apply outside Ontario?
The holiday list is Ontario’s. A province with a different list will differ on a span containing one of its own holidays.
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