Splanner displays different times than the actual appoibtments

[AC Question]

New phone s5 neo... everything was brought over from my old phone. The calendar or s planner shows one time of day in the calendar window (month view) and another when you open the appointment item. This is insane! The times differ by 30 from what i can see but no way to be sure. Without this app working properly, for me a cell phone is just an expensive paperweight. Please help.