private static String maybeQuoteETag(String eTag) {
        if (!eTag.startsWith("\"") && !eTag.endsWith("\"")) {
            eTag = "\"" + eTag + "\"";
        }
        return eTag;
    }
Parse ISO 8601 timestamp into seconds since 1970.
src/main/java/org/gaul/s3proxy/S3ProxyHandler.java