Method yymmdd

java/lib/src/main/java/io/github/ccxt/base/Time.java:210–223

(Object ts, Object infix)

    }

    public static String yymmdd(Object ts, Object infix) {
        String sep = (infix == null) ? "-" : String.valueOf(infix);
        if (ts == null) return null;
        try {
            long ms = Long.parseLong(String.valueOf(ts));
            Instant inst = Instant.ofEpochMilli(ms);
            DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yy" + sep + "MM" + sep + "dd")
                                                     .withZone(ZoneOffset.UTC);
            return fmt.format(inst);
        } catch (Exception ignored) {
            // match the C# version which swallows and returns empty string on failure
            return "";
        }
    }

    public static String yymmdd(Object ts) {
        return yymmdd(ts, "");