The ReadEventLog UDF returns an array for each event one of the columns is the time it was generated.
Element 12 and/or 13 contain what you want to know.

 Quote:

; Column 0 = Category
; Column 1 = CategoryString
; Column 2 = ComputerName
; Column 3 = Data
; Column 4 = EventCode
; Column 5 = EventIdentifier (see http://support.microsoft.com/default.aspx?scid=kb;en-us;245222)
; Column 6 = EventType
; Column 7 = InsertionStrings
; Column 8 = Logfile
; Column 9 = Message
; Column 10 = RecordNumber
; Column 11 = Source Name
; Column 12 = TimeGenerated
; Column 13 = TimeWritten
; Column 14 = Type
; Column 15 = User
_________________________
Mart

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