Given a week-day (1-7), how can I calculate what that week-day’s last date was?
Example: Today is Wednesday, 2008/11/12, and I want to know what last Friday’s date was.
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Given a week-day (1-7), how can I calculate what that week-day’s last date was?
Example: Today is Wednesday, 2008/11/12, and I want to know what last Friday’s date was.
If
todayis the current day of the week, then you can use something like:This assumes that Friday is represented by day number 6 of the week (that is, 1 represents Sunday). Then subtract
days_since_fridayfrom the current date, and you’ll get the date of the end of last week.The above expression is slightly more complicated than it needs to be. If your day-of-week started at 0 for Sunday, it simplifies to:
or