javascript - 使用 C# 从 DatePicker 获取周 ID

Question

获取weekid的代码如下

 CultureInfo ciCurr = CultureInfo.CurrentCulture;
  int Weekid = ciCurr.Calendar.GetWeekOfYear(dt, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

When I try for date 31/12/2018 it showed me week Id 53 but in my DatePicker it showed week Id 1

DatePicker 引用图片

问题:

哪个是正确的？

如何使 C# 代码或 jquery 代码的更改相同？

Answer 1

试试这段代码..

来源:https://stackoverflow.com/a/11154921/1997983

 var d = new DateTime(2018, 12, 31);
            CultureInfo cul = CultureInfo.CurrentCulture;

            var firstDayWeek = cul.Calendar.GetWeekOfYear(
                d,
                CalendarWeekRule.FirstDay,
                DayOfWeek.Monday);

            int weekNum = cul.Calendar.GetWeekOfYear(
                d,
                CalendarWeekRule.FirstDay,
                DayOfWeek.Monday);

            int year = weekNum == 52 && d.Month == 1 ? d.Year - 1 : d.Year;
            Console.WriteLine("Year: {0} Week: {1}", year, weekNum);

根据 ISO-8601，第 53 周返回 1

http://blogs.msdn.com/b/shawnste/archive/2006/01/24/iso-8601-week-of-year-format-in-microsoft-net.aspx

如果您查看 2018 年 12 月 31 日这一周，它将从 12 月 30 日星期六开始。从今年到 2018 年，它将只包含两个日期。30 和 31。其余所有 5 个日期都来自明年，即 2019 年。因此它返回 1 作为周数，根据 ISO-8601 标准这是正确的。