Provide a military time format.
Excel currently allows formatting times in the format of 13:30. For many professions (military, law enforcement, medical, and aviation), the proper format is 1330. This should be easy to accomplish by just eliminating the colon. I checked in other languages, but could not find that option.
Michael Daughety commented
You should be able to select the hh:mm time and click on Custom, then remove the colon.