1. Access the preferences pane.
   
   Keyboard shortcut: Command key (it has a ⌘ symbol) and then the ","
   
   
   
   
2. Click the General, then in the Date/Time format section take notice of Use Local Format checkbox. When checked the Date popup is limited to only 4 predifined formats based on the local settings of your mac.
   
   
   
   When Use Local Format is unchecked the Date popup has 18 different formats.
   
   
   
   

If you don't see the format you would like, please let us know and we will try to add it in a future update.