Weekday Counter — Count Mondays, Fridays, or Any Day Between Two Dates

The Nth-in-month filter counts which occurrence of that weekday within each calendar month the date represents. For example, May 5, 2025 is a Monday — it's the 1st Monday of May 2025. May 12 is the 2nd Monday. May 19 is the 3rd. May 26 is the 4th. If you select "3rd in month only", only May 19 would appear in your list for May. For the "last in month" option, the tool finds the highest Nth value for each month — so if there are 5 Mondays, the 5th is the last; if only 4, the 4th is the last. The "5th in month (if exists)" option only shows dates when there actually is a 5th occurrence, which happens in months where the weekday falls on the 29th, 30th, or 31st. This filter works across multiple selected weekdays — each day is checked independently for its Nth position in its month.

The step filter takes the full list of matching dates (after applying any Nth-in-month filter) and then keeps only every Nth occurrence. Every 2nd (biweekly) keeps occurrences 1, 3, 5, 7… — i.e., every other one starting from the first match. Every 3rd keeps occurrences 1, 4, 7, 10… Every 4th keeps occurrences 1, 5, 9, 13… Note that the step is counted per-day when multiple days are selected — so if you select Monday and Wednesday with "Every 2nd", you'll get every other Monday separately and every other Wednesday separately. This is useful for biweekly meeting schedules, fortnightly payroll Fridays, or any recurring pattern that isn't exactly every week.

If you have "Include start date" checked, the start date itself is tested against your selected weekdays — if it matches, it's included in the count and list. Same for "Include end date." If unchecked, those specific dates are excluded even if they fall on a selected weekday. This matters in legal and financial contexts: a contract "from Monday to Monday inclusive" includes both Mondays, while "from Monday to Monday exclusive" only includes the first one. By default, both endpoints are included. This is most noticeable for short ranges — for a 7-day range starting on Monday and ending on Sunday, including both endpoints with Monday selected gives 2 Mondays (start + none in middle + no end-Monday), while excluding the end gives 1. For longer ranges the difference is usually just 0 or 1 total.

Yes — this is one of the unique features of this tool. Click any number of day buttons to select multiple weekdays. The count shows the combined total of all selected days, and the date list shows all matching dates merged in chronological order with the day name next to each date. For example, selecting Monday + Wednesday + Friday with a 6-month range will show all M/W/F dates in order, with the total count. You can also use the quick-select buttons: "Weekdays (M-F)" selects all five working days, "Weekends" selects Saturday and Sunday, "Mon/Wed/Fri" selects those three, and "Tue/Thu" selects those two. The all-7 breakdown table always shows the individual counts for every day so you can compare even when multiple are selected.

Three copy formats are available. Copy plain produces a newline-separated list of dates in the format "Mon, Jan 6, 2025" — useful for pasting into documents, emails, or any plain text context. Copy CSV produces comma-separated values with a header row: Date,Day,Week Number,Nth in Month,Gap (days) — paste this directly into Excel, Google Sheets, or any CSV-compatible tool. Copy ISO dates produces newline-separated dates in YYYY-MM-DD format (e.g., 2025-01-06) — ideal for pasting into code, SQL queries, JSON arrays, or date-picker tools that require ISO format. All three formats copy to your clipboard instantly with no download required.