java - 获取给定月份每周的开始日期和结束日期

2022-01-11 00:00:00 date calendar java

以下是我用来计算给定月份的周开始日期和结束日期的代码.假设周开始日是星期一，周末结束日是星期日.例如，2013 年 1 月将有 5 周.如果月份从星期日开始 - 忽略那一天

Following is the code that I am using to calculate the week start date and end date for the given month. Assume week start day is MONDAY and week end day is SUNDAY. For example, JANUARY, 2013 will have 5 weeks. If the month starts with Sunday - ignore that day

2013 年 1 月第一周 - 2012 年 12 月 31 日至 2013 年 1 月 6 日第二周 - 2013 年 1 月 7 日至 2013 年 1 月 13 日第三周 - 2013 年 1 月 14 日至 2013 年 1 月 20 日第四周 - 2013 年 1 月 21 日至 2013 年 1 月 27 日第五周 - 2013 年 1 月 28 日至 2013 年 2 月 3 日

January 2013 first week - 31-Dec-2012 to 06-Jan-2013 second week - 07-jan-2013 to 13-jan-2013 Third week - 14-jan-2013 to 20-jan-2013 fourth week - 21-jan-2013 to 27-jan-2013 fifth week - 28-jan-2013 to 03-Feb-2013

public static void main(String[] args) {
    List<List<String>> weekdates = getNumberOfWeeks(2013, Calendar.JULY);
    for(List<String> weekDatesLoop:weekdates){
        System.out.println("Start day: "+weekDatesLoop.get(0).toString());
        System.out.println("End day: "+weekDatesLoop.get(1).toString());
    }
  }
public static List<List<String>> getNumberOfWeeks(int year, int month) {
        System.out.println("Month Id: "+month);
        month = month-1;
        System.out.println("Month Id: " + month);
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
        List<List<String>> weekdates = new ArrayList<List<String>>();

        List<String> dates = new ArrayList<String>();
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month);
        c.set(Calendar.DAY_OF_MONTH, 1);
        dates.add(format.format(c.getTime()));
        //int numOfWeeksInMonth = 1;
        while (c.get(Calendar.MONTH) == month) {
          //System.out.println(c.get(Calendar.DAY_OF_WEEK) );

          if (c.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            dates.add(format.format(c.getTime()));
            weekdates.add(dates);
          }
          else if (c.get(Calendar.DAY_OF_WEEK) == Calendar.MONDAY) {
            dates = new ArrayList<String>();
            dates.add(format.format(c.getTime()));
            //numOfWeeksInMonth++;
          }
          c.add(Calendar.DAY_OF_MONTH, 1);
        }
        if(dates.size() < 2){
          c.add(Calendar.DAY_OF_MONTH, -1);
          dates.add(format.format(c.getTime()));
          weekdates.add(dates);
        }
        System.out.println(weekdates);
        return weekdates;
      }

我仍在努力.谁能帮我解决这个问题?

I am still working on this. Can anyone please help me in fixing this?

推荐答案

我用下面的代码得到答案

I get the answer with the following code 

List<List<String>> getNumberOfWeeks(int year, int month) {
        SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy");
        List<List<String>> weekdates = new ArrayList<List<String>>();
        List<String> dates;
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month);
        c.set(Calendar.DAY_OF_MONTH, 1);
        while (c.get(Calendar.MONTH) == month) {
                dates = new ArrayList<String>();
              while (c.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
                c.add(Calendar.DAY_OF_MONTH, -1);
              }
              dates.add(format.format(c.getTime()));
              c.add(Calendar.DAY_OF_MONTH, 6);
              dates.add(format.format(c.getTime()));
              weekdates.add(dates);
              c.add(Calendar.DAY_OF_MONTH, 1);
        }
        System.out.println(weekdates);
        return weekdates;
      }

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