Currently, there isn't any difference between an All Day events and events at a specific time in Korganizer. See bug report https://bugs.kde.org/show_bug.cgi?id=414260
Here is how this looks in Google calendar:
Currently, there isn't any difference between an All Day events and events at a specific time in Korganizer. See bug report https://bugs.kde.org/show_bug.cgi?id=414260
Here is how this looks in Google calendar: