将每小时时间戳从 GMT 转换为 PDT 的问题

Question

I'm looking for answers to the below query.

   select count(1), to_char(DATE_CREATED,'DD-MM-YYYY HH24') from GDPR where DATE_CREATED>sysdate-1
    group by to_char(DATE_CREATED,'DD-MM-YYYY HH24') order by to_char(DATE_CREATED,'DD-MM-YYYY HH24');

  COUNT(1) TO_CHAR(DATE_
---------- -------------
         4 22-07-2020 02
        32 22-07-2020 03
        33 22-07-2020 09
         7 22-07-2020 14
        26 22-07-2020 15

Here the hour field(02,03....) that I'm getting is in GMT. I wanted it in PDT. I tried to cast it in new_time function but it's getting erred out as invalid month. Not sure what's the issue. Any help will be appreciated. Thank you.

Answer 1

From GMT to PDT you can use new_time. ie

SELECT date_created, new_time(date_created, 'GMT', 'PDT') FROM gdpr;

Make sure, that date_created is of datatype DATE.

To cut minutes/seconds and convert to vc2, use the to_char function with the result of new_time(), ie to_char(new_time(date_created, 'GMT', 'PDT'), 'DD.MM.YYYY HH24')