Hvordan konverteres menneskelig dato til unix tidsstempel i Mysql?

mysql> select unix_timestamp('2008-01-08 19:23:32');
+---------------------------------------+
| unix_timestamp('2008-01-08 19:23:32') |
+---------------------------------------+
|                            1199849012 |
+---------------------------------------+
1 row in set (0.04 sec)

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