Java is 10-bit and 13-bit timestamp, convert format viewable time

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Accounting Floor

If the specified interface document type String, note must not contain l, can only contain numbers

public static String timestamp2Date(String str_num) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        if (str_num.length() == 13) {
            String date = sdf.format(new Date(toLong(str_num)));
            System.out.println ( "the timestamp 13:" + str_num + "into a string:" + date);
            return date;
        } else {
            String date = sdf.format(new Date(toLong(str_num) * 1000));
            System.out.println ( "10-bit timestamp:" + str_num + "into a string:" + date);
            return date;
        }
    }

    public static long toLong(String obj) {
         return Long.parseLong(obj);
    }

    @Test
    public void Te(){
        String aaa = "1566802997242";
        String bbb = "1566801239";
        System.out.println(aaa.length());
        System.out.println(bbb.length());
        timestamp2Date(aaa);
        timestamp2Date(bbb);



    }