In the admin panel, under Pilot Reports(Pireps), when you edit a pirep it says “Enter as hours - “5:30” is five hours and thirty minutes” as an example. But it seems that you DO NOT use a " : " there at all. Seeing as the database uses a colon. Just thought I would bring it up, because if you were to use a colon and then you went into edit it again, it would have a comma.
I double check and convert it to the proper format in the backend.