Java 如何从给定的一年中的一周、一周中的一天、一年中的一周中获取Calendar.MONTH

知道年、年中的周和周中的日可以获得年中的月和月中的日。比如说

 // corresponding to September 15, 2012 if week starts on Monday
 int weekNum = 38;
 int dayNum = 6;
 int year = 2012;

 // set the calendar instance the a week of year and day in the future
  Calendar aGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
 aGMTCalendar.setFirstDayOfWeek(Calendar.MONDAY);    
 aGMTCalendar.set(Calendar.WEEK_OF_YEAR,weekNum ); 
 aGMTCalendar.set(Calendar.DAY_OF_WEEK,dayNum );
 aGMTCalendar.set(Calendar.YEAR,year);

// get the month and day of month
 int   monthGMT = aGMTCalendar.get(Calendar.MONTH + 1); // returns 38  not 9

 int   dayOfMonthNumGMT = aGMTCalendar.get(Calendar.DAY_OF_MONTH); 
 // returns 14 but I wanted 15

谢谢

这应该是

// +1 to the value of month returned, not to the value of MONTH constant.
int monthGMT = aGMTCalendar.get(Calendar.MONTH) + 1;  

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获取

monthGMT

的方式有一个类型。应该是：

int monthGMT = aGMTCalendar.get(Calendar.MONTH) + 1;

在每次调用

aGMTCalendar.set（）

后，将下面的行放在调用

dayNum

one后，日期从15变为14。

aGMTCalendar.set（Calendar.DAY\u OF_WEEK，dayNum）

忽略

setFirstDayOfWeek

，但是在设置

周OF_YEAR

时会考虑该设置

System.out.println(aGMTCalendar.getTime());

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尝试

Calendar.SATURDAY

constant而不是

6

literal

---

日历。周六实际上是
7
而不是
6
谢谢您的回复。虽然我试图通过aGMTCalendar将一周的第一天设置为星期一（星期一应为1）。setFirstDayOfWeek（Calendar.Monday）当我输入dayOfWeekNum weekNum=6 38时，我得到了month/day=9/14再次感谢您的帮助。。。我还在挣扎
 // corresponding to September 15, 2012 if week starts on Monday
 int weekNum = 38;
 int dayNum = 6;
 int year = 2012;

  // set the calendar instance the a week of year and day in the future
  Calendar aGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
 aGMTCalendar.setFirstDayOfWeek(Calendar.MONDAY);    
 aGMTCalendar.set(Calendar.WEEK_OF_YEAR,weekNum ); 
 aGMTCalendar.set(Calendar.DAY_OF_WEEK,dayNum );
 aGMTCalendar.set(Calendar.YEAR,year);

 // get the month and day of month
 int   monthGMT = aGMTCalendar.get(Calendar.MONTH) + 1; 
 // should be 10
 int   dayOfMonthNumGMT = aGMTCalendar.get(Calendar.DAY_OF_MONTH) + 1; 
 // should be 15