PostgreSQL 9.6中带有时区的时间戳

Question

I am currently searching my transaction table using the following query. The second TO_TIMESTAMP is specified as 2019-08-21..

SELECT t.* FROM Transaction t WHERE t.datetime >= TO_TIMESTAMP('2019-01-01T07:54:34','YYYY-MM-ddTHH:MI:SS')
AND t.datetime < TO_TIMESTAMP('2019-08-21T14:38:34','YYYY-MM-ddTHH:MI:SS') AND (t.location_1 = 2001 OR t.location_2 = 2001);

It returns me the following result:

When i change the second TO_TIMESTAMP to 2019-08-22.. It returns me the current day's result. I am not sure why I need to add one more day in order to retrieve the current day's result..

The current timezone in the PostgreSQL 9.6 is:

Answer 1

This is your problem:

SELECT TO_TIMESTAMP('2019-08-21T14:38:34','YYYY-MM-ddTHH:MI:SS');

      to_timestamp      
------------------------
 2019-08-21 00:38:34+00
(1 row)

The unescaped T confuses the parser (the actual result may even be buggy).

Use the correct format string:

SELECT TO_TIMESTAMP('2019-08-21T14:38:34','YYYY-MM-DD"T"HH24:MI:SS');
      to_timestamp      
------------------------
 2019-08-21 14:38:34+00
(1 row)