判断当天是不是周末

private boolean isWeekendDay(){
        Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+08:00"));    //获取东八区时间
        int day = c.get(Calendar.DAY_OF_WEEK);
        if(day==1 || day==7){
            return true;
        }
        return false;
    }