private static SimpleDateFormat getDateFormat() {
        SimpleDateFormat format = new SimpleDateFormat("yy'w'ww", Locale.US);
        format.setLenient(false);
        return format;
    }
Retrieve the snapshot date parser.
<p>
We have to create a new instance of SimpleDateFormat every time as it is not thread safe.
@return The date formatter.
helper/src/main/java/me/lucko/helper/reflect/SnapshotVersion.java