Option to record all day events as Working Hours Only in O365 (8:00 - 17:30)

Our scenario is that Appogee writes full day events into Office 365 calendars as "All Day". Our Office 365 calendars subsequently syncs to our management PSA system (ConnectWise Manage) which we use for scheduling all of our staff. This platform cannot process "all day events" in Office 365 calendars so approved full days do not show causing us management issues. A quick work around would be the option for Appogee to record approved full days leave in Outlook between 8:00 - 17:30.