I just want to make sure I understand this correctly. I want the sprinklers to come on one hour before sunrise on Friday. Weather Underground reports that sunrise on Friday is at 5:41 AM. If I program the sprinklers to turn on 1 hour before sunrise and run for 30 minutes, the sprinklers should turn on at 4:41 AM and turn off at 5:11 AM? When I change the program to that, the program preview currently shows that will start at ~6:22 AM and turn off at ~6:52 AM, but that is wrong? Soon this should be a moot point and it will show the correct time in the program preview?