Need some quick and easy code to validate a date range

I have two text boxes on a form that a user enters dates in.


I would like some code to check that the range entered is valid.  In other words, that then t_end_date does not occur before the t_start_date.

1/1/2011  and 12/31/2011  - Good

1/1/2011 and 12/31/2010  - no good
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Something like:
If FormatDateTime(DATE1, vbShortDate) < FormatDateTime(DATE2, vbShortDate) = True Then
MsgBox ("Please enter a valid date.")

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Above code works only for year and day (not month),
try code below:

If DateDiff("s", Date1, Date2) < 0 Then
'Date1 is later than Date2
'Date2 is later than Date1
End If

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