If you notice that the lights are not turning on/off based on the theme's day/night time settings, it may be that the SmartTerras date and time are not set. You will need to synchronize the date and time of your unit via the mobile application:
Steps:
1. From the home screen, go to menu | Settings | Advanced Settings
2. Click "continue" when prompted
3. On the Advanced Settings screen, click on the date and time to synchronize the unit with your mobile phone.
4. You should notice that the date/time change to match your local time.
5. Go back to the home screen and see if this fix the issue