daily(Hour:Min)

Run each day at Hour:Min. Min is rounded to a multitude of 5.

weekly(Day, Hour:Min)

Run at the given Day and Time each week. Day is either a number 1..7 (1 is Monday) or a weekday name or abbreviation.

monthly(DayOfTheMonth, Hour:Min)

Run each month at the given Day (1..31). Note that not all months have all days.

This must be used with a timer that broadcasts a maintenance(_,_) message (see broadcast/1). Such a timer is part of library(http/http_unix_daemon).