When the AllDayEvent property returns true, the End property returns a value that is 23 hours, 59 minutes, and 59 seconds later than midnight of the day that contains the value of the EndDateTime property. When AllDayEvent returns false, the End property returns a value that is one second earlier than the actual value of the EndDateTime property.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2