Question

了解年份，星期和星期几是否可以获得一年中的月份和一个月中的某一天。例如

 // 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

Answer 1

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;

Answer 2

获取monthGMT的方式有类型。它应该是：

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

在每次aGMTCalendar.set()来电之后放下一行，您会看到在调用dayNum之后，日期从15更改为14. aGMTCalendar.set(Calendar.DAY_OF_WEEK, dayNum)忽略setFirstDayOfWeek但是，在设置WEEK_OF_YEAR时会考虑这一点。

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

Answer 3

尝试Calendar.SATURDAY常量而不是6字面值。

Calendar.SATURDAY实际上是7而不是6。

Answer 4

 // 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

如何从给定的WEEK_OF_YEAR，DAY_OF_WEEK，YEAR获取Calendar.MONTH

4 个答案: