原来一直使用postgresql的函数来拼凑，今天突然发现竟然可以这么简单，直接用timestamp(0)来解决就好了：
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ls=> select createtime::timestamp(0) without time zone from users;
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createtime
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2015-10-03 01:32:03
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2015-10-03 01:32:03
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2015-10-03 01:32:03
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(3 行记录)
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ls=> select createtime::timestamp without time zone from users;
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createtime
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2015-10-03 01:32:03.080415
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2015-10-03 01:32:03.080415
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2015-10-03 01:32:03.080415
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(3 行记录)
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