抓住自己最有兴趣的东西，由浅入深，循序渐进地学……
下面是具体的实现代码：
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sqlite>SELECTdatetime(1377168853,'unixepoch','localtime');
+------------------------------------------------+
| datetime(1377168853,'unixepoch','localtime') |
+------------------------------------------------+
| 2013-08-22 18:54:13 |
+------------------------------------------------+
1 rowinset
sqlite>SELECTstrftime('%s','now');
+----------------------+
| strftime('%s','now') |
+----------------------+
| 1380728519 |
+----------------------+
1 rowinset
sqlite>SELECTdatetime('now');
+---------------------+
| datetime('now') |
+---------------------+
| 2013-10-02 15:40:44 |
+---------------------+
1 rowinset
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