You often see these in the database for IPB and elsewhere. They are the number of seconds since Jan 1st 1970.
To translate (either to or from) you can use this > http://www.onlinecon...m/unix_time.htm
Examples to help explain a bit more...
Monday, 10th September 2007 00:00:00 GMT = 1189382400
Tuesday, 20th December 1994 23:44:10 GMT= 787967050
904587921 = Monday, 31st August 1998 18:25:21 GMT
341234236 = Friday, 24th Oct 1980 11:17:16 GMT
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