引用：http://www.itokit.com/2011/0517/66276.html

Android的文件有建议用Time代替Calendar。用Time对CPU的负荷会较小。在写Widget时特别重要。

Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。

来看下IT动力的完整代码吧：

唯一不足是取出时间只有24小时模式.

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long time=System.currentTimeMillis();
 final Calendar mCalendar=Calendar.getInstance();
 mCalendar.setTimeInMillis(time);
 取得小时：mHour=mCalendar.get(Calendar.HOUR);
 取得分钟：mMinuts=mCalendar.get(Calendar.MINUTE);

 如何获取Android系统时间是24小时制还是12小时制 
        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)

利用Calendar获取
 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)