[GENERAL] Timestamp from an OID?

[Dennis Muhlestein]

I've been passively collecting data for a few months.  I realized, after 
a while, that I never added a timestamp column to the table the data is 
being stored in.  I've since added that.

Is there a way to find out when the previous rows were inserted?  There 
is a serial integer for the primary key on the table.
The server version 8.1.4
Thanks
Dennis

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