mysql - Order by date time with AM PM -

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I want to write a selected query with the order by datetime field. My date field is in the following format 

  2014-04-21 05:30 PM 2014-04-21 06:30 am 2014-04-21 10:30 am   
  SELECT SELECT ORDER by STR_TO_DATE (`date_time`, '% h.% I% p')  
 
 You need to save the date using the DATETIME format in the right format, Makes it easy. However, in your case you can do the form  by  SELECT * ORDER date_format (STR_TO_DATE (`date_time`, '% y-% m-% d% h:% i% p') ., '% Y-% m-% d% H:% i:% s');

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