ThreadLocal.withInitial(() -> new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.ENGLISH));

    /** RFC 1123 date formatter */
    private static final DateTimeFormatter RFC_1123_FORMATTER =
            DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.ENGLISH).withZone(ZoneId.of("GMT"));

    /**

    /** Thread-local SimpleDateFormat for parsing non-standard date formats */
    private static final ThreadLocal<SimpleDateFormat> DATE_FORMAT_HOLDER =
            ThreadLocal.withInitial(() -> new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.ENGLISH));

    /**
     * Parses the last modified date from a string value.
     * First attempts to parse using Apache DateUtils (which supports RFC 1123, RFC 1036, and ANSI C formats).