Setting the glide.ui.list_edit.show_calendar_only system property does not alter the date picker format.
For more information, see the product documentation topic Configure the date picker for the list editor.
Steps to Reproduce
Navigate to a list or form that has a date field on it. Invoke the Date Picker to see what it looks like.
Change the setting of the glide.ui.list_edit.show_calendar_only to the opposite setting.
Clear the cache by going to /cache.do, and then log out and log in again.
Go back to the list/form and check the date picker on the same field.
Note that the it has not changed and the default format displays regardless of the system property setting.
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Related Problem: PRB1241416