Is there a way to auto-lock a cell after a date is entered?

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What I'm trying to do is have a date entered in B2 and then have the cell auto-lock so the date can't be changed by another user. I know how to lock select cells, protect sheet and all that jazz but I just don't know if this is possible. Let me quickly explain how the excel sheet will be used. I have dispatch (for a trucking company) fill out a truck repair order for our maintenance and then we are setting up another computer down at the shop that mirrors what the dispatch sees. I just don't want an employee to be able to change a date after it is entered and I don't want dispatch to have to go through the process of locking and unlocking cells. Any help would be great. Thanks!

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 You need this macro:

Private Sub Worksheet_Change(ByVal Target As Range)

If Target.Column = 1 And Target.Value <> "" Then

    ActiveSheet.Protect Contents:=False
    Range(Target.Address).Locked = True
    ActiveSheet.Protect Contents:=True

End If

End Sub

Insert it into the sheet where the dates go. To do that, right-click the desired sheet tab and click View Code and input the code into the window that opens.

This assumes that the dates will be in column A. Change the 1 to 2 for column B and 3 for C etc.

Before you run the macro though, make sure to "unlock" all of the cells in the worksheet.

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