title: Convert a string (in date format) to datetime using Javascript
body: <p>In BIRT, i have a column containing a datetime stored as a string. I need to convert these string to datetime format and put the result in another column using Javascript. 
  The string is the form of: for example: Fri 21 Feb 2014, 09:40 AM. </p>
  
  <p>Hence this when converted to a datetime format and exported to excel, the column should be treat as a date.
  Can any one of you help me to do it? </p>
  
  <p>Cheers,</p>