Weekday Occurrences Calculator

Count how many of a given weekday fall between two dates.

Start date

End date

Weekday

Mondays in range

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What this calculator does

This calculator counts how many times a specific weekday occurs between two dates, inclusive of both endpoints.

Worked example

Between September 1, 2026 and September 30, 2026, there are4 Fridays.

Common mistakes

Forgetting a month can have 4 or 5 of a given weekday. Most months have exactly 4 occurrences of each weekday, but any month with more than 28 days can have a 5th for some weekdays.
Excluding the endpoints. If the start or end date itself falls on the chosen weekday, it still counts.

Frequently asked questions

What is this useful for?+

Common uses include figuring out how many Mondays are in a school term, how many Fridays fall in a pay period, or how many times a recurring online meeting will occur in a date range.

Are both the start and end dates included?+

Yes — if the start or end date itself matches the chosen weekday, it counts toward the total.

Does the order of the two dates matter?+

No — enter them in either order and the calculator will count the same way.

How many Mondays (or any weekday) are in a given date range?+

Pick your start date, end date, and target weekday above, and this calculator counts the exact number of occurrences between them, including both endpoints.

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