In the AWI, when you execute an Object once and then select the Date/Time radio button, the time format is always displayed in AM/PM.
Changing the time format in the 'Settings' of the AWI to 24-hour format has not effect on the display in 'Execute Once'.
Due to a bug/missing feature in Vaadin, the UI Component only read the AM/PM settings from the locale settings.
Therefore, if the locale is en_UK, the AM/PM settings will not be present, while in the en_US they would be present.
The Calendar component was extended to read the AM/PM settings, from the formatting that is used in the input.