如何从Oracle中包含时区偏移量的日期/时间字符串中获取UTC日期/时间

Question

Given a string like this: '2015-11-23T07:00:10.563-04:00' I am trying to determine the UTC date/time which I would expect to be: '2015-11-23 11:00:10.5630000'

I have tried the following:

SELECT sys_extract_utc(
        to_timestamp_tz('2015-11-23T07:00:10.563-04:00', 
                        'yyyy-mm-dd"T"hh24:mi:ss.FF TZH:TZM')
         )  
FROM DUAL;

but this produces the result:

2015/11/23 03:00:10.563000000

Even when I change the timezone offset to positive, I get the same result. I must be misunderstanding something so would appreciate your help.

Answer 1

There is no space between fractional seconds and timezone hour. So remove space from you pattern, and it'll give desired result.

SQL> SELECT sys_extract_utc(to_timestamp_tz('2015-11-23T07:00:10.563-04:00', 'yyyy-mm-dd"T"hh24:mi:ss.FFTZH:TZM'))  
FROM DUAL; 

SYS_EXTRACT_UTC(TO_TIMESTAMP_TZ('2015-11-23T07:00:10.563-04:00','YYYY-MM-DD
---------------------------------------------------------------------------
23-NOV-15 11.00.10.563000000 AM

Answer 2

Fixed it - the space character between ".....hh24:mi:ss.FF TZH:TZM" was causing the problem.

This now works perfectly:

SELECT sys_extract_utc(to_timestamp_tz('2015-11-23T07:00:10.563+04:00', 'yyyy-mm-dd"T"hh24:mi:ss.FFTZH:TZM'))  FROM DUAL;