date.java

   public static Date convertStringToDate(String dateFormat, String dateInString) throws ParseException {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat formatter = new SimpleDateFormat(dateFormat);

        try {
            formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
            cal.setTime(formatter.parse(dateInString));
        } catch (Exception e) {
            formatter = new SimpleDateFormat(dateFormatDefault);
            formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
            cal.setTime(formatter.parse(dateInString));
        }


        return cal.getTime();
    }

//cara penggunaan
Date createdAt = convertStringToDate("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "2019-11-16T06:02:46");
Long timestamp = createdAt.getTime();