Achieving chronological sort on a date column with month function

Hello all ,
I have a a date column(start_date) on which I applied 'MONTHNAME' function to extract the month name
out of the date . i.e. 4/24/2013 will return 'Apr' .
While trying to achieve a sort on this , its returning alphabetical sorting , i.e.
aug , apr , dec , jul ,jun etc .
So achieving a chronological order , I created a logical column 'sort_month' . In the expression section,
I wrote , month(start_date) . so this return numeric values of months , i.e . 1,2,3, 4 etc.
Now , in 'start_date' column properties i have selected this 'sort_month' column ,
sort on column . So , this should add a chronological sorting order to start_date column ?
well its not working !
Am I missing anything here ?

Logical column general properties and set 'sort order column' to months
Edited by: Srini VEERAVALLI on Apr 23, 2013 1:55 PM

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Achieving chronological sort on a date column with month function

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