Date and time
One time zone for your whole church.
Settings, then Date & Time holds a single setting: your church's time zone. Requires the Manage date and time settings permission.
Pick your zone from the list and save. Every event date and time in the app is shown in this zone, and scheduled notifications go out based on it.
You normally set this once, in the setup wizard, and never touch it again. If events are showing at the wrong time, this is the first place to check; see Troubleshooting.