Calculators / Quick tool
Find the first through fifth, or last, requested weekday in a calendar month.
◎ This calculation runs entirely in your browser. The date settings are not uploaded.
Enter one rule per line using numbers or weekday names. A bad row stays local to that row and never blocks the rest.
◎ Rules, results and exported files stay in this browser.
| Line | Rule | Date | Weekday | Status |
|---|
Method, example & boundaries
Resolve calendar rules such as “the third Thursday” or “the last Monday” into an exact date. The single-rule calculator supports one decision, while the batch workflow validates up to 200 independent rules and can export reviewed results as CSV or all-day ICS events.
Thursday, November 19, 2026.November 1, 2026 is a Sunday. The first Thursday is November 5; adding two seven-day intervals gives November 19.
For an nth occurrence, the calculator finds the weekday offset from the first day of the month and adds whole weeks. For “last,” it works backward from the final calendar day. A requested fifth occurrence returns a field-level error when that weekday appears only four times.
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