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Editorial Team
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Asked: 2026-05-25T21:05:48+00:00

I read a lot of tutorial which uses hh23 and hh24 interchangeably. to do

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I read a lot of tutorial which uses hh23 and hh24 interchangeably. to do to_char on oracle. Is the hh23 a legacy syntax? I tried doing it on simple query and it causes an error.

select to_char(sysdate, ‘hh23’), to_char(sysdate, ‘hh24’) from dual

I’m trying to find a reference to this but there is none. Or is the tutorial just written wrong? For example on http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:59412348055.

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1 Answer

  1. Editorial Team

    I think it’s just a typo.

    SQL> select to_char(sysdate, 'hh23:mi:ss') from dual
  2  /
select to_char(sysdate, 'hh23:mi:ss') from dual
                        *
ERROR at line 1:
ORA-01821: date format not recognized


SQL> select to_char(sysdate, 'hh24:mi:ss') from dual
  2  /

TO_CHAR(
--------
11:25:21

SQL>
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