从varchar转换为日期时间以进行排序

Question

I have column with varchar datatype . which contains date as below format:

04-JAN-18 11.23.32.195734 AM +05:30

I need to sort rows based on latest timestamp.What is the function to use?

SELECT *
FROM ent_organizations
order by TO_TIMESTAMP(updatedtimestamp,'YYYY-MON-DD HH.MI.SS.FF') desc

ORA-01830: date format picture ends before converting entire input string 01830. 00000 - "date format picture ends before converting entire input string" *Cause:
*Action:

Answer 1

Convert the string to TIMESTAMP like this:

TO_TIMESTAMP_TZ(updatedtimestamp,'DD-MON-YY HH.MI.SS.FF AM TZH:TZM', 'NLS_DATE_LANGUAGE = american') 

If you use it for sorting then it will be based on UTC times, not local time values.