Typically the Enloe bells are about 30 seconds off compared to iphone/chromebook time.
The Enloetime clock accounts for the delay, but if you go off this schedule and a correct clock, your clock will not.

1st period: 7:25-8:52
2nd period: 8:58-10:35
Lunch: 10:41-11:16
3rd period: 11:20-12:47
4th period: 12:53-2:20