How to convert unformated timestamp to default stimestamp?

[qshao () sfu ca]

Hi, experts:
I have a quick question, when I use "tcpdump -tt -r dumpfile, I got unformat
timestamp something like 1031393106.447964. When I use "tcpdump -tttt r
dumpfile", I got timstamp like          9/07/2002 10:05:06.447964. It's
straight forward to see that part from seocnd to micro second, both method
are the same. I am wondeing what's rule to convert the unformat time stamp
to the format like 9/07/2002/ 10:05:06.447964. 
Many thanks.
kenny
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