import    java.text.SimpleDateFormat;       
       
SimpleDateFormat    formatter    =   new    SimpleDateFormat    ("yyyy年MM月dd日    HH:mm:ss     ");       
Date    curDate    =   new    Date(System.currentTimeMillis());//获取当前时间       
String    str    =    formatter.format(curDate);  

SimpleDateFormat    sDateFormat    =   new    SimpleDateFormat("yyyy-MM-dd    hh:mm:ss");       
String    date    =    sDateFormat.format(new    java.util.Date());    

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM");    
String date=sdf.format(new java.util.Date());  

df=DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL,Locale.CHINA);  
System.out.println(df.format(new Date()));  

ContentResolver cv = this.getContentResolver();  
       String strTimeFormat = android.provider.Settings.System.getString(cv,  
                                          android.provider.Settings.System.TIME_12_24);  
        
       if(strTimeFormat.equals("24"))  
      {  
              Log.i("activity","24");  
       }  

Calendar c = Calendar.getInstance();  
取得系统日期:year = c.get(Calendar.YEAR)  
               month = c.grt(Calendar.MONTH)  
               day = c.get(Calendar.DAY_OF_MONTH)  
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);  
                  minute = c.get(Calendar.MINUTE)  

Calendar c = Calendar.getInstance();  
取得系统日期:year = c.get(Calendar.YEAR)  
               month = c.grt(Calendar.MONTH)  
               day = c.get(Calendar.DAY_OF_MONTH)  
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);  
                  minute = c.get(Calendar.MINUTE)  
                    Calendar c = Calendar.getInstance();  
取得系统日期:year = c.get(Calendar.YEAR)  
                   month = c.grt(Calendar.MONTH)  
                   day = c.get(Calendar.DAY_OF_MONTH)  
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);  
                     minute = c.get(Calendar.MINUTE)

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。  
int year = t.year;  
int month = t.month;  
int date = t.monthDay;  
int hour = t.hour; // 0-23  
int minute = t.minute;  
int second = t.second;