How to Change Time Format
how to change time format between 12h and 24h
different between 12h format and 24h format

Tap at the time format option in the Willow setting app, then it will display a dialog for you to choose between 24h format(military time) or 12h format

Hold down at the watch face screen and tap at the setting icon below, scroll down to the "Time format" option. Tap to toggle between 12h format and 24h format
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Option 1 : Change from Willow Setting App
Option 2 : Change from Watch Setting App