PRJ: Using DateDifference to Calculate Planned % Complete

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The following macro uses the DateDifference method to calculate a task's planned percent complete based on working time. A task's planned percent complete can be used for custom earned value calculations.

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Sub Planned_Percent_Complete()
   'Get the current date.
   dCurrentDate = ActiveProject.CurrentDate
   'Loop through each task in the project
   For Each ATask In ActiveProject.Tasks
      PlPctComp = 0
      'skip blank rows
      If Not ATask Is Nothing Then
      'Check for Baseline Start and Baseline Finish
         If (IsDate(ATask.BaselineStart) And _
            IsDate(ATask.BaselineFinish)) Then
            'Zero duration tasks
            If dCurrentDate >= ATask.BaselineFinish Then
               PlPctComp = "100%"
            Else
               vTemp = Application.DateDifference(ATask.BaselineStart, _
                       ATask.BaselineFinish)
               If vTemp = 0 Then
                  PlPctComp = "0%"
               Else
                  PlPctComp = 		     
Format(Application.DateDifference(ATask.BaselineStart, _
                   dCurrentDate) / vTemp, "0%")
               End If
            End If
            ATask.Text1 = PlPctComp
         Else
            'No baseline start/finish, set to NA
            ATask.Text1 = "NA"
         End If
       End If
   Next ATask
End Sub