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;