I wish this were easier to setup but until Apple opens up Standby mode to developers this is the workaround!

1. To open Clocks automatically when charging, we need to use Apple’s official Shortcuts app or use this shortcut: https://www.icloud.com/shortcuts/ffd2c1db8a6f4f24bcf9f473f1b472e6

1. Then tap the Automation tab at the bottom of your screen then tap “New Automation”
2. Scroll the list and select Charger

1. Select “Run Immediately” then tap Next
2. Search for the Clocks app
3. Select “Open Clock”

Done! In the next step we’ll cover how to change what clock opens by default.

On the shortcuts tab, tap the three dot icon on the your Open Clock shortcut

Tap the blue Clock 1 option, and pick which out of your list you want to open.