Get UnixTimeStamp in Java

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Current UnixTimeStamp:

long currentUnixTimestamp = System.currentTimeMillis()/1000;

In  MYSQL:
 1) From date to UnixTimestamp:  SELECT UNIX_TIMESTAMP('2012-12-27 08:03:00');

2) From UnixTimeStamp to date:  SELECT FROM_UNIXTIME(1356618379);

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