Oracle sql convert timestamp into format -

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i have timestamp column 'ts'. need convert format:

'dd-mon-yyyy hh24:mi'.

i used complete requirement: 

to_char(ts, 'dd-mon-yyyy hh24:mi').

the problem returns string. using oracle apex , outputting in table. table allows sorting. when sort sorts column string , not date, sorting not accurate. how can convert timestamp format need while still being timestamp/date field (any type long accurately sort real dates).

@sstan right. there 4 date formats can set @ workspace level, , @ application level: application date format, application date time format, application timestamp format, , application timestamp time zone format. way timestamp stays timestamp , sorts correctly. select application, click on edit application properties button (top rightish), click on globalization button (top leftish), , there can set date formats.


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