def obtain_comment_time(comment_id = nil, format = "%H:%M:%S")
      return nil if comment_id.blank?
      comment = Comment.find_by_id(comment_id)
      comment = comment.submitted_on.strftime(format) if !comment.blank?
      comment if !comment.blank?
    end
def obtain_comment_time(comment_id = nil, format = "%H:%M:%S")
      return nil if comment_id.blank?
      comment = Comment.find_by_id(comment_id)
      comment = comment.submitted_on.strftime(format) if !comment.blank?
      comment if !comment.blank?
    end
returns the time of the given comment
 Params:
 +comment_id+:: ID of the comment
 +format+:: the format that you want the time to be returned in