What day does the number 1 represent on my Hunter SVC controller?
Day 1 can be set to represent any day of the week. In the Current Date and Time setting you'll be required to set today's day, this will provide the controller a reference point.
If today is Friday and you set the current day as the number 5, you've now established that the 1st day or Day 1 would be Monday.
The majority of time Day 1 is set as Sunday or Monday.