public static void main(String[] args) {
Long time = System.currentTimeMillis();
System.out.println(time);
System.out.println(transferLongToDate("yyyy-MM-dd HH:mm:ss",time));
}
private static String transferLongToDate(String dateFormat, Long millSec) {
SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
Date date = new Date(millSec);
return sdf.format(date);
}