importjava.text.ParseException;
importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.TimeZone;
publicclassTest{
       publicstaticvoidmain(String[]args){
              SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");
              Calendarcalendar=Calendar.getInstance();
              System.out.println(calendar.getTime());
              System.out.println(calendar.getTimeInMillis());
              System.out.println(calendar.getTimeZone());
              System.out.println("===============獲取不同時區的時間Calendar的TimeZone==============");
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT")).getTime());
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT+8")).getTime());
              System.out.println("==Calendar的getTime方法返回值是沒有時區的  所以結果一樣==");
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT")).getTimeZone());
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT+8")).getTimeZone());
              System.out.println("===============獲取不同時區的時間Calendar的Hour==============");
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT")).get(Calendar.HOUR));
              System.out.println(Calendar.getInstance(TimeZone.getTimeZone("GMT+8")).get(Calendar.HOUR));
              System.out.println("===============獲取不同時區的時間SimpleDateFormat==============");
              sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
          System.out.println(sdf.format(calendar.getTime()));
          sdf.setTimeZone(TimeZone.getTimeZone("GMT+8"));
          System.out.println(sdf.format(calendar.getTime()));
          
          System.out.println("=========Calendar設定指定時間點 ==1.date===========");
          Calendarcal=Calendar.getInstance();
          Datedate=newDate();
         SimpleDateFormatformat=newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         try{
                date=format.parse("2017-12-04 19:29:29");
                System.out.println(format.format(date));
              }catch(ParseExceptione){
                     e.printStackTrace();
              }
         System.out.println("=========Calendar設定指定時間點 ==2.Calendar===========");
         Calendarcals=Calendar.getInstance();
         //Calendar 的 month 從 0 開始，也就是全年 12 個月由 0 ~ 11 進行表示。 此處如果傳12則顯示下一年1月
         cals.set(2017,11,04,19,28,28);
         System.out.println(format.format(cals.getTime()));
         
         System.out.println("==============Calendar顯示當前時間====================");
         Calendarss=Calendar.getInstance();
         ss.setTime(newDate());
         System.out.println(format.format(ss.getTime()));
         System.out.println(format.format(Calendar.getInstance().getTime()));
         
         System.out.println("==============Calendar顯示當前年月日時分秒周幾====================");
         System.out.println("current year="+ss.get(Calendar.YEAR));
         System.out.println("current month="+(ss.get(Calendar.MONTH)+1)+"");
         System.out.println("current day="+ss.get(Calendar.DAY_OF_MONTH));
         System.out.println("current week of day="+(ss.get(Calendar.DAY_OF_WEEK)-1)+"");
         System.out.println("current hour="+ss.get(Calendar.HOUR));
         System.out.println("current HOUR_OF_DAY="+ss.get(Calendar.HOUR_OF_DAY));
         System.out.println("current minutes="+ss.get(Calendar.MINUTE));
         System.out.println("current seconds="+ss.get(Calendar.SECOND));
         
         System.out.println("===========設定時間一小時前 、兩天後===========");
         ss.add(Calendar.HOUR,-1);
         System.out.println(format.format(ss.getTime()));
         ss.add(Calendar.DAY_OF_MONTH,-2);
         System.out.println(format.format(ss.getTime()));
         
         System.out.println("==============Calendar時間比較 ，設定2小時後================");
         CalendarnewCalendar=Calendar.getInstance();
         newCalendar.add(Calendar.HOUR,2);
         //指定引數大於被比較數 返回1  小於返回-1 等於返回 0
         System.out.println("比較時間大小 結果="+newCalendar.compareTo(ss));
         System.out.println("==============Calendar時間比較 ，設定1天以前================");
         newCalendar.add(Calendar.DAY_OF_MONTH,-1);
         System.out.println("比較時間大小 結果="+newCalendar.compareTo(ss));
         
         System.out.println("==========獲取指定兩個時間點之間的時間差===========");
         longmills=ss.getTimeInMillis()-newCalendar.getTimeInMillis();
         System.out.println("毫秒差"+mills);
         //====要計算時間差，可用 Calendar.getTimeInMillis() 取得兩個時間的微秒級的時間差，再加以換算即可，比如獲得相差天數，程式碼如下：====
         System.out.println("毫秒差"+mills/(24*60*60*1000));//轉換成小時
         
         System.out.println("================顯示當年天數當月天數當月星期數===============");
         Calendarcalendar2=Calendar.getInstance();
         calendar2.set(calendar2.YEAR,2017);
         calendar2.set(calendar2.MONTH,10);
         System.out.println(calendar2.getActualMaximum(calendar2.DAY_OF_MONTH));
         System.out.println(calendar2.getActualMaximum(calendar2.DAY_OF_YEAR));
         System.out.println(calendar2.getActualMaximum(calendar2.DAY_OF_WEEK));
         System.out.println(calendar2.getActualMaximum(calendar2.DAY_OF_WEEK_IN_MONTH));
       }
       
       @org.junit.Test
       publicvoidgetDays(){
              //時間精確到時分秒時會出現時間間隔除以（24*60*60*1000）四捨五入為0的情況，此時就要按day_of_year來算天數。跨年加上所跨               年度總天數
              //相隔時間不滿一天轉int為0
              Calendarc1=Calendar.getInstance();
              c1.set(2016,12,30,20,0,0);
              Calendarc2=Calendar.getInstance();
              c2.set(2016,12,31,8,0,0);
              intres=(int)((c1.getTimeInMillis()-c2.getTimeInMillis())/(24*60*60*1000));
              System.out.println("相隔天數"+getDaysBetween(c1,c2)+"====按毫秒差算出的天數"+res);
              
       }
       //當遇到兩天相隔不足一天的，可以用該方法，更通用
       publicintgetDaysBetween(Calendard1,Calendard2){   
       if(d1.after(d2)){ // swap dates so that d1 is start and d2 is end   
            java.util.Calendarswap=d1;   
           d1=d2;   
           d2=swap;   
       }   
       intdays=d2.get(Calendar.DAY_OF_YEAR)-d1.get(Calendar.DAY_OF_YEAR);   
       inty2=d2.get(Calendar.YEAR);   
       if(d1.get(Calendar.YEAR)!=y2){   
           d1=(Calendar)d1.clone();   
           do{   
               days+=d1.getActualMaximum(Calendar.DAY_OF_YEAR);//得到當年的實際天數   
               d1.add(Calendar.YEAR,1);   
           }while(d1.get(Calendar.YEAR)!=y2);   
       }   
       returndays;   
   }
}