下面是具体的实现代码：
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sqlite> SELECT datetime(1377168853, 'unixepoch', 'localtime');+------------------------------------------------+| datetime(1377168853, 'unixepoch', 'localtime') |+------------------------------------------------+| 2013-08-22 18:54:13 |+------------------------------------------------+1 row in setsqlite> SELECT strftime('%s','now');+----------------------+| strftime('%s','now') |+----------------------+| 1380728519 |+----------------------+1 row in setsqlite> SELECT datetime('now');+---------------------+| datetime('now') |+---------------------+| 2013-10-02 15:40:44 |+---------------------+1 row in set |
