Help:Using Order by for a date column fetching wrong results

Hi all,
In my table I am having a date column which is having values
13/06/2007 09:24:00
31/05/2007 10:30:00
I am selecting this column with some other columns using order by at the end by giving the date column.
But I am getting rows in reverse order like above. I am using to_char(start_time,'dd/mm/yyyy hh:24mi:ss') in the select.
If I give to_date(start_time) in the order by the values are fetching correclty.But I was not allowed to use to_char in the select statement.
Kindly suggest me where it went wrong.
Thanks in advance.

Hi , Thanks for the update. Actually that column was an Oracle DATE type. Earlier I gave simply that column name alone in the order by clause. That is getting falied only if the 2 entries falls in different months. Otherwise that is perfect.
So I gave to_date in the order by. But now I am facing a problem in the selecing that column.

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Help:Using Order by for a date column fetching wrong results

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