If a schedule is not running at the designated time, it may be because the Decora Smart Wi-Fi device has the incorrect time and it may be necessary to enter or re-enter the address for your residence so that it gets the correct time for its location.
In the My Leviton app select the menu button in the upper left corner.
Select Residence Settings to edit the Residence.
Enter - or re-enter - your address, then tap Save.
Now, create a test schedule and see if it runs at the designated time.
If it is still not working, try Using the Location Service: https://decorasmartsupport.zendesk.com/hc/en-us/articles/360018106773-Schedule-not-Running-Use-Location-Service