convert date to timestamp Oracle

Posted on 2014-12-12
Last Modified: 2014-12-15
Hi experts, I need to convert a date column:
'11-DEC-14 PM'

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'11/12/2104 01:17:00.801271'

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I Known that I must use to_timestamp, but I can´t find the solution.

Could you help me with this issue?
Thanks, is urgent!
Question by:carlino70
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LVL 51

Expert Comment

ID: 40496871
you convert string to date?
date to string?

what data you have now?
LVL 34

Expert Comment

ID: 40496877
What is the datatype of the original?  It cannot be a date because I see fractional seconds.  I assume it is a timestamp and you are looking to make a different format?

The format elements are listed here ->

What you are showing would be TO_CHAR(col1, 'dd/mm/yyyy hh:mi:ss.ff6')

However, you may actually want TO_CHAR(col1, 'dd/mm/yyyy hh24:mi:ss.ff6')  so that you can differentiate between AM and PM.
LVL 51

Expert Comment

ID: 40496894
select TO_TIMESTAMP('11-DEC-14 PM', 'DD-MON-YY HH.MI.SS.FF PM') from dual


select TO_TIMESTAMP('11-DEC-14 PM', 'DD-MON-YY HH.MI.SS.FF6 PM') from dual
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Author Comment

ID: 40500585
SQL> SELECT TO_TIMESTAMP(TO_CHAR(sysdate,'dd-Mon-yy HH24:MI:SS'),'dd-mon-yyyy HH24:MI:SS') salida FROM dual;
15-DEC-14 PM

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But with the adding:
SQL> SELECT substr(TO_TIMESTAMP(TO_CHAR(sysdate,'dd-Mon-yy HH24:MI:SS'),'dd-mon-yyyy HH24:MI:SS'),1,28) salida FROM dual;

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That is the solution.
LVL 76

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 250 total points
ID: 40500597
If the column is already a DATE data type, there is no need for all the to_char and to_timestamp stuff.  No need to take it to a string and then back:

select cast(sysdate as timestamp) from dual;
LVL 34

Accepted Solution

johnsone earned 250 total points
ID: 40500600
Why are you taking a date, converting it to a string, converting it to a timestamp and then back to a string?

Why wouldn't you use:

select to_char(systimestamp, 'dd-MON-yy') from dual;

That should give you the exact same thing without all the conversions.
LVL 13

Expert Comment

by:Alexander Eßer [Alex140181]
ID: 40500603
I totally agree with slightwv: I don't see any purpose (that would make sense) in all that converting back and forth. Keep it as simple as possible ;-)

Author Closing Comment

ID: 40501227

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