PostgreSQL does not store time zone in `timestamp with time zone` data type

PostgreSQL has two variants of a type called 'timestamp': timestamp with time zone and timestamp without time zone . At a first glance, it looks as if those two data types must differ in terms of what and how is being stored, but that's not exactly the case. In PostgreSQL, with time zone variant doesn't physically store any time zone information. This fact is a key to understand how those two…