Android获取系统时间的多种方法

void getTime1(){ 
    long time=System.currentTimeMillis();//long now = android.os.SystemClock.uptimeMillis(); 
    SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    Date d1=new Date(time); 
    String t1=format.format(d1); 
    Log.e("msg", t1); 
  } 

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH:mm:ss"); 
    String t=format.format(new Date()); 
    Log.e("msg", t); 

void getTime3(){ 
  Calendar calendar = Calendar.getInstance(); 
  String created = calendar.get(Calendar.YEAR) + "年" 
      + (calendar.get(Calendar.MONTH)+1) + "月"//从0计算 
      + calendar.get(Calendar.DAY_OF_MONTH) + "日" 
      + calendar.get(Calendar.HOUR_OF_DAY) + "时" 
      + calendar.get(Calendar.MINUTE) + "分"+calendar.get(Calendar.SECOND)+"s"; 
  Log.e("msg", created); 
  } 

void getTime4(){ 
    Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。 
    t.setToNow(); // 取得系统时间。 
    String time=t.year+"年 "+(t.month+1)+"月 "+t.monthDay+"日 "+t.hour+"h "+t.minute+"m "+t.second; 
    Log.e("msg", time); 
  } 

Calendar calendar = Calendar.getInstance(); 
      int day = calendar.get(Calendar.DAY_OF_WEEK); 
      String today = null; 
      if (day == 2) { 
        today = "Monday"; 
      } else if (day == 3) { 
        today = "Tuesday"; 
      } else if (day == 4) { 
        today = "Wednesday"; 
      } else if (day == 5) { 
        today = "Thursday"; 
      } else if (day == 6) { 
        today = "Friday"; 
      } else if (day == 7) { 
        today = "Saturday"; 
      } else if (day == 1) { 
        today = "Sunday"; 
      } 
      System.out.println("Today is:- " + today); 

SimpleDateFormat f1= new SimpleDateFormat(); //其中没有些格式化参数，我们使用默认的日期格式。
System.out.println(f.formate(new Date()));

SimpleDateFormat f4= new SimpleDateFormat("今天是"+"yyyy年MM月dd日 E kk点mm分");
//可根据不同样式请求显示不同日期格式，要显示星期可以添加E参数
System.out.println(f4.format(new Date()));
//代码输出的日期格式为：今天是2012年03月22日 星期四 16点46分
SimpleDateFormat formater = new SimpleDateFormat("yyyyMMdd hh:mm:ss");
System.out.println("Date to String "+formater.format(new Date()));
//相近的常用形式还有 yyMMdd hh:mm:ss yyyy-MM-dd hh:mm:ss dd-MM-yyyy hh:mm:ss

 Timestamp t ;
 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
 try ...{
  t = new Timestamp(format.parse("2007-07-19 00:00:00").getTime());
 } catch (ParseException e) ...{
  e.printStackTrace();
 }
 Timestamp t ;
 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
 t = new Timestamp(new Date().getTime());