code: function(loggingEvent) {
  		return loggingEvent.categoryName + "~" + loggingEvent.startTime.toLocaleString() + " [" + loggingEvent.level.toString() + "] " + loggingEvent.message + this.LINE_SEP;
  	}
docs: Implement this method to create your own layout format.
  @param {Log4js.LoggingEvent} loggingEvent loggingEvent to format
  @return formatted String
  @type String