ISO 周计算记录

news/2025/9/29 15:01:33/文章来源:https://www.cnblogs.com/itstac/p/19118786

java不太熟悉但.需要java版的.一开始写的是javascript.此处只记录个思路

 1 import java.time.LocalDate;
 2 import java.time.temporal.ChronoUnit;
 3 import java.time.temporal.WeekFields; 
 4 
 5 public class tmain {
 6     public static void main(String[] args) {
 7 
 8        getTest();
 9     }
10 　　static WeekFields weekFields = WeekFields.ISO;
11 
12    private static void getTest() {
13 
14       class WeekOfYearModel {
15 
16         public int baseYear;
17         public int weekNum;
18 
19         public WeekOfYearModel(int byear, int wkn) {
20           this.baseYear = byear;
21           this.weekNum = wkn;
22         }
23 
24         public long subtract(WeekOfYearModel wk) {
25           long re ;
26           if (this.baseYear == wk.baseYear) {
27             re = this.weekNum - wk.weekNum;
28           } else {
29             long max ,min;
30             LocalDate sDate, eDate;
31             int xs = 1;
32             if (this.baseYear > wk.baseYear) {
33               sDate = getFirstDayOfFirstWeekByYear(wk.baseYear);
34               eDate = getFirstDayOfFirstWeekByYear(wk.baseYear + 1).plusDays(-1);
35               max = this.weekNum;
36               min=wk.weekNum;
37             } else {
38               sDate = getFirstDayOfFirstWeekByYear(this.baseYear);
39               eDate = getFirstDayOfFirstWeekByYear(this.baseYear + 1).plusDays(-1);
40               max = wk.weekNum;
41               min=this.weekNum;
42               xs = -1;
43             }
44            // max +=Math.ceilDiv(ChronoUnit.DAYS.between(sDate, eDate), 7) ;
45            max +=(ChronoUnit.DAYS.between(sDate, eDate)+7-1)/7 ; 
46            re = (max - min) * xs;
47           }
48           return re;
49         }
50 
51       }
52   
53       WeekOfYearModel sdate=new WeekOfYearModel(2025,2);
54       WeekOfYearModel edate = new WeekOfYearModel(2024, 52);
55 
56       long d= sdate.subtract(edate);
57 
58     }
59     public static LocalDate getFirstDayOfFirstWeekByYear(int year) {
60         int cYear = year;
61         LocalDate theWeekFirstDayOfCurrentYear;
62         LocalDate firstDayOfYear = LocalDate.of(cYear, 1, 1) ;
63         int weekDayOffirstDay = firstDayOfYear.get(weekFields.dayOfWeek());
64         if (weekDayOffirstDay > 4) {          
65             //1号是去年最后一周下周一是今年第一周的第一天
66             theWeekFirstDayOfCurrentYear = firstDayOfYear.plusDays((7 - weekDayOffirstDay) + 1);
67         } else if (weekDayOffirstDay > 1) {
68             theWeekFirstDayOfCurrentYear =firstDayOfYear.plusDays((weekDayOffirstDay-1)*-1);
69         } else {
70             theWeekFirstDayOfCurrentYear = firstDayOfYear;
71         }
72         return theWeekFirstDayOfCurrentYear;
73     }
74     public static int getWeekOfYear(LocalDate data) {      
75       return data.get(weekFields.weekOfWeekBasedYear());
76     }
77 }

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