系统时间、星期、年月日

long time = System.currentTimeMillis();

SimpleDateFormat sdff = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

Date date = new Date(System.currentTimeMillis());

String str_date = sdf.format(date);

Calendar calendar = Calendar.getInstance();

int year = calendar.get(Calendar.YEAR);

//从0开始，一月得到的month=0
int month = calendar.get(Calendar.MONTH);

int day = calendar.get(Calendar.DAY_OF_MONTH);

int weekk = calendar.get(Calendar.DAY_OF_WEEK);

Date date = new Date(System.currentTimeMillis());

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

String week = "周";

if(calendar.get(Calendar.DAY_OF_WEEK) == 1)
{
week +="日";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 2)
{
week +="一";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 3)
{
week +="二";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 4)
{
week +="三";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 5)
{
week +="四";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 6)
{
week +="五";
}else if(calendar.get(Calendar.DAY_OF_WEEK) == 7)
{
week +="六";
}

//最终获取的格式是：周六