计算给定年份的周数 [英] calculate number of weeks in a given year

问题描述

我想得到任何一年的周数。即使 52 被接受为全球通用答案， 2015 ， 2020 和 2026 实际上有 53 周。

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解决方案

有没有什么办法可以计算这个，关于 ISO周日日期格式的维基百科文章，您可以使用以下代码计算。

 日历cal = Calendar.getInstance（）; 
 cal.set（Calendar.YEAR，2015）; 
 cal.set（Calendar.MONTH，Calendar.DECEMBER）; 
 cal.set（Calendar.DAY_OF_MONTH，31）; 
 
 int ordinalDay = cal.get（Calendar.DAY_OF_YEAR）; 
 int weekDay = cal.get（Calendar.DAY_OF_WEEK） -  1; // Sunday = 0 
 int numberOfWeeks =（ordinalDay  -  weekDay + 10）/ 7; 
 System.out.println（numberOfWeeks）; 
  

I would like to get the number of weeks in any given year. Even though 52 is accepted as a generalised worldwide answer, the calendars for 2015, 2020 and 2026 actually have 53 weeks.

Is there any way that I can calculate this, or any functions that will help me out?

解决方案

According to the wikipedia article on ISO week date format, You can calculate it using following code.

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR, 2015);
    cal.set(Calendar.MONTH, Calendar.DECEMBER);
    cal.set(Calendar.DAY_OF_MONTH, 31);

    int ordinalDay = cal.get(Calendar.DAY_OF_YEAR);
    int weekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; // Sunday = 0
    int numberOfWeeks = (ordinalDay - weekDay + 10) / 7;
    System.out.println(numberOfWeeks);

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