public static String getDays(Date date){
    Calendar cal=Calendar.getInstance();
    cal.setTime(date);
    long oldTime=cal.getTimeInMillis();
    long nowTime=System.currentTimeMillis();
    long days=(nowTime-oldTime)/(1000*60*60*24);//天数
    long hours=((nowTime-oldTime)%(1000*60*60*24))/(1000*60*60);//小时数
    long minutes=(((nowTime-oldTime)%(1000*60*60*24))%(1000*60*60))/(1000*60);//分钟数
    long seconds=((((nowTime-oldTime)%(1000*60*60*24))%(1000*60*60))%(1000*60))/1000;//秒数
    return days+"天"+hours+"小时"+minutes+"分钟"+seconds+"秒";
  }