Root Cause: The issue with date format on Execute Once and Date/Time in the AWI cannot be changed to 24-hour format has not been back ported to 12.1.1
Update to a fix version listed below or a newer version if available.
Fix Status: In Progress
Automic Web Interface 12.2.0 - Planned release date: 2018-06-29
Automic Web Interface 12.1.2 - Planned release date: 2018-05-23