Specific Weekday Adder

How the Specific Weekday Adder works

The Specific Weekday Adder takes a start date and counts forward to the Nth occurrence of a particular weekday — the 4th Monday from today, the 6th Friday from a kickoff, the 10th Wednesday from a start date. Choose the start date, how many occurrences you want, and which weekday (or weekdays) count, and the tool steps forward day by day, tallying only the matching weekdays until it reaches the one you asked for. The result is the exact calendar date of that occurrence.

This is a different question from adding business days. Adding business days counts every working day; the weekday adder counts only a chosen day of the week. If you select Monday and ask for four, the tool returns the date of the fourth Monday strictly after the start — it does not count the start date itself even if the start date is a Monday, because the count begins on the next day. That "strictly after" rule is what makes recurring schedules line up cleanly without an off-by-one error on the first occurrence.

You can select more than one weekday at once, which is useful for cadences that fall on, say, every Tuesday and Thursday. In that mode the tool counts each matching day toward your total, so asking for six occurrences of Tuesday-or-Thursday lands on the sixth such day — three weeks out. Because it walks real calendar dates, the answer is correct across month and year boundaries without any manual adjustment.

Worked example

You run a weekly check-in every Monday and want the date of the fourth one starting from a Wednesday. Select Wednesday as the start, choose Monday as the target weekday, and ask for four. The tool steps forward to the first Monday after the start, then the second, third, and fourth — returning a date about four weeks out. Switch the target to both Monday and Thursday and ask for four, and it lands on the fourth Monday-or-Thursday instead, roughly two weeks out.

Frequently asked questions