Adding a comma to format localtime

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All,
  I use this line of code:
  my $datetime = join ' ', (split ' ', localtime)[0,2,1,4,3];
   
  To create this result:
  Mon 9 Apr 2007 09:15:05
   
  How can I add a comma to this result to get:
  Mon, 9 Apr 2007 09:15:05
   
  Best and thanks,
  Gregg

 	 
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