public static String padStartDateStr(String timestamp) {
		return boundTimestamp(padDigits(timestamp,LOWER_TIMESTAMP_LIMIT,
				UPPER_TIMESTAMP_LIMIT,LOWER_TIMESTAMP_LIMIT));
	}
public static String padStartDateStr ( String timestamp ) { return boundTimestamp ( padDigits ( timestamp , LOWER_TIMESTAMP_LIMIT , UPPER_TIMESTAMP_LIMIT , LOWER_TIMESTAMP_LIMIT ) ) ; }
clean up timestamp argument assuming earliest possible values for missing
or bogus digits.
@param timestamp String
@return String