the UNIX epoch 0 start date (January 1st, 1970).

Operating System internal time is commonly stored in a data structure using a long integer containing the number of seconds since 1970. This time is used in all time-related processes such as scheduling, file timestamps, etc.

The number GG_JMS_TIMESTAMP=1284668199946 is a Java timestamp (number of milliseconds that have passed since January 1, 1970 GMT), equivalent to "Thu Sep 16 13:16:39 PDT 2010". This is the time the JMS message was created.

1970/01/01 01-JAN-1970