in the document library, go to library settings--> click on the date columnfields (Start Time and End Time) and check date and time format property make sure date & time is selected
in the document library, go to library settings--> click on the date column and check date and time format property make sure date & time is selected
in the document library, go to library settings--> click on the date fields (Start Time and End Time) and check date and time format property make sure date & time is selected