When the value of the PercentComplete property is zero, the CompleteThrough property returns the value of the StartDateTime property. When PercentComplete returns a non-zero value, the task's Duration is multiplied by the ratio of completion as determined by PercentComplete, and the result of that calculation is added to the StartDateTime to produce the CompleteThrough date.
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