In order for Schedules to work properly, your account time zones need to be correctly set.
When the app is installed on the device we take a time reading and set the local time as the time zone for schedules. There is no need to manually override the time zones on the devices.
But if the system cannot determine the time zone the default time zone is UTC. Which is great if you live in London, not so great if you live in NYC.
To change the time zone:
Open the Safe Center portal
Open the "Settings" menu
Select the correct time zone and hit "Change"