The interval programming data contains a field for the number of days in the interval between watering, and a “starting in XX days” field that tells the controller when to start executing the program. Once an interval program has been executing for some time does the Starting-in field show the number of days until the program runs again?
That is correct. That number is relative to today’s date. For example, if a program started on Apr 9, repeating every 3 days, then when you check the program on Apr 10 it will say starting in 2 days, and on April 11 it will say starting 1 day and so on.