I worked on an IoT platform for a while that struggled with this. Our workaround was to tell support to tell people to not set automations to run on the quarter

I worked on an IoT platform for a while that struggled with this. Our workaround was to tell support to tell people to not set automations to run on the quarter, half, 3 quarters or hour mark. Something set to run at 7:14 or 7:16 PM would run every night, something set to run at 7:15 was a crapshoot.