正确的方法是什么?
Calendar cal = Calendar.getInstance();
cal.set(2012, 6, 28, 16, 0);
long endTime = cal.getTimeInMillis();
long currentTime = System.currentTimeMillis();
long remaining = endTime - currentTime;
long seconds = remaining / 1000;
long minutes = seconds / 60;
long hours = minutes / 60;
long days = hours / 24;