title: subtract if the day of the week is a saturday or sunday
body: <p>if the subtracted date is a saturday or sunday then subtract more days, before adding to arraylist</p>
  
  <p>when i do this, the date stays the same and doesnt subtract, i get a conversion string to double error</p>
  
  <pre><code>Dim aftersubtraction As Date
                      Dim fromatafter As Date
                      aftersubtraction = departuredate.AddDays(-dates1.Text)
                      fromatafter = aftersubtraction.AddDays(-gracep.Text)
  
                      If fromatafter.DayOfWeek = "Saturday" Then
                          fromatafter.AddDays(-1)
                          dates.Add(fromatafter.ToString("MM/dd/yyyy"))
                      ElseIf fromatafter.DayOfWeek = "Sunday" Then
                          fromatafter.AddDays(-2)
                          dates.Add(fromatafter.ToString("MM/dd/yyyy"))
                      Else
                          dates.Add(fromatafter.ToString("MM/dd/yyyy"))
                      End If
  </code></pre>