This is a common date obfuscation technique that was much used at one time. I think you will find that this code reveals the date for you:
Dim iSecs As Integer
Dim dtDate As Date
iSecs = 1203213660
dtDate = DateAdd("s", iSecs, #01/01/1970 11:00:00#)
The result I got from this code was (USA): 2/17/2008 1:01:00 PM
I would try checking the dates returned against this script, and if they are consistent, use the base date and time, and then use it to display the date as needed, like on the On Format event of a report. Add: Me.DateTextBox = dtDate
I have seen this used in SQL Server applications so it is not unique to UNIX, although the base date may be significant to UNIX.
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Look it up at: http://wrox.books24x7.com