Assuming EST is PST minus 3 hours, enter 03:00 in a spare cell and choose Edit|Copy. Select your list of times choose Edit|Paste Special, check Subtract and click OK.
Edit - I guess it should be check Add instead of Subtract (EST is PST + 3 hours)
...here are a couple ways to do this if you really still do not have an answer.
If these values are in one column starting in A1, then...
Non-VBA:
In another cell (B1 or wherever) enter the formula
=A1+TIME(3,,)
and copy down as needed.
VBA:
Sub Test1()
Application.ScreenUpdating = False
Dim LR As Long
LR = Cells(Rows.Count, 1).End(xlUp).row + 1
With Range("B1:B" & LR)
.Formula = "=RC1+TIME(3,,)"
.Value = .Value
End With
Columns(2).AutoFit
Columns(1).Delete
Application.ScreenUpdating = True
End Sub
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