The ISY has system values for “day of month”, “month”, “year” and so on, but these system values cannot be used in program conditions directly: the values need to be stored in program variables first. Then these variables can be used for programs and folders in conditions for partial dates, e.g., “if day-month is 16-12 then …”, which is supposed to run the program’s then block yearly on December 16th. A program runs daily at midnight which sets these integer variables to the numbers of toda