PostgreSQL 相比其他数据库，提供了极其精细的时间类型体系，包括 timestamp、timestamptz、interval 等，其中 timestamptz 以UTC存储、按会话时区展示，能从根本上避免跨时区数据错乱。 掌握时间类型的设计原理，是正确使用时间函数的前提。

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