神谕。更正时间戳与时区的偏移量

Question

我正在执行这个 select 现在

SELECT FROM_TZ(to_timestamp('2015-08-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'),'Asia/Singapore') AT TIME ZONE 'UTC'
FROM DUAL

我对 time 很感兴趣，在这种情况下时间是 02:00 AM，因为 Singapore 与 8 hours 中的 UTC 不同。
一切正常，但是，如果我将月份从 08 更改为 01，我希望得到 03:00 AM，因为 Singapore 是冬天]，但我又得到了 02:00 AM。
所以问题是，我怎样才能用正确的偏移量得到正确的结果？

Answer 1

Asia/Singapore 没有任何夏令时，请参阅此处：Singapore Standard Time

太疯狂了，Oracle 正确地实现了这个列表：

SELECT FROM_TZ(TO_TIMESTAMP('2015-01-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'), 'Asia/Singapore') AS TS FROM DUAL;
TS                                      
----------------------------------------
08.01.2015 10:00:00.000000000 +08:00    
1 row selected.

SELECT FROM_TZ(TO_TIMESTAMP('1970-01-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'), 'Asia/Singapore') AS TS FROM DUAL;
TS                                      
----------------------------------------
08.01.1970 10:00:00.000000000 +07:30    
1 row selected.

SELECT FROM_TZ(TO_TIMESTAMP('1943-01-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'), 'Asia/Singapore') AS TS FROM DUAL;
TS                                      
----------------------------------------
08.01.1943 10:00:00.000000000 +09:00    
1 row selected.

SELECT FROM_TZ(TO_TIMESTAMP('1940-01-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'), 'Asia/Singapore') AS TS FROM DUAL;
TS                                      
----------------------------------------
08.01.1940 10:00:00.000000000 +07:20    
1 row selected.

SELECT FROM_TZ(TO_TIMESTAMP('1920-01-08 10:00:00', 'yyyy-mm-dd hh24:mi:ss'), 'Asia/Singapore') AS TS FROM DUAL;
TS                                      
----------------------------------------
08.01.1920 10:00:00.000000000 +07:00    
1 row selected.

神谕。更正时间戳与时区的偏移量

Oracle. Correct offset in timestamp with timezone

sql

oracle

oracle11g

timestamp-with-timezone