code: public static DateTime fromString(String rfc3339Timestamp) {
  		if (rfc3339Timestamp == null) {
  			return null;
  		}
  		
  		DateTime dateTime = new DateTime(rfc3339Timestamp, DateTimeZone.UTC);
  		return dateTime;
  	}
docs: Helper for parsing rfc3339 compliant timestamp from string
  
  @param rfc3339Timestamp timestamp as string in rfc3339 format
  @return {@link DateTime} representing rfc3339 compliant timestamp from parameter