如何手动正确配置NodeTime iWeekyArRule?

我正在包装NodaTime,以便在我们的软件中使用,为了证明未来的可靠性,我想我应该根据Bcl DateTimeFormat设置iWeekyArrule,如下所示:

var culture = CultureInfo.CurrentCulture;
var weekRule = WeekYearRules.FromCalendarWeekRule(
    culture.DateTimeFormat.CalendarWeekRule,
    culture.DateTimeFormat.FirstDayOfWeek);

在挪威,我们遵循以下设置:

CalendarWeekRule.FirstFourDayWeek
DayOfWeek.Monday

然而,令我惊讶的是,当我查看以下两个日期的周数时, kalender.no 不同意:

2018-12-31: week 53 of 2018 (kalender.no says week 1 [implied: of 2019])
2019-01-01: week 1 of 2019  (kalender.no agrees here)

但是,如果我使用WeekyarRules。Iso,他们都返回“2019年第一周”,这是正确的。

我有一大堆问题,但让我们关注最直接的一个:

我如何编写代码来“证明未来”图书馆的这一部分,这样当我们开始将软件推广到世界上更多的地方时,它就能根据当地文化准确地计算周数?

或者这是不可能的,因为文化信息不包含这一点?

这里有一个 LINQPad 演示NodaTime行为的示例(很抱歉没有首先包含[mcve]:

void Main()
{
    "-------------- ISO --------------".Dump();
    Test(WeekYearRules.Iso);

    "-------------- BCL --------------".Dump();
    Test(WeekYearRules.FromCalendarWeekRule(CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday));
}

public static void Test(IWeekYearRule rule)
{
    var date = new LocalDate(2018, 12, 31);
    $"{date}, {rule.GetWeekOfWeekYear(date)} in {rule.GetWeekYear(date)}".Dump();

    date = new LocalDate(2019, 1, 1);
    $"{date}, {rule.GetWeekOfWeekYear(date)} in {rule.GetWeekYear(date)}".Dump();
}

输出:

-------------- ISO --------------
mandag 31. desember 2018, 1 in 2019
tirsdag 1. januar 2019, 1 in 2019
-------------- BCL --------------
mandag 31. desember 2018, 53 in 2018
tirsdag 1. januar 2019, 1 in 2019

(需要明确的是,ISO输出是挪威的正确输出)

这是NodaTime 2.4.4,Windows 10。NET 4.7.2。

下面是一个不使用NodaTime的LINQPad示例:

void Main()
{
    var culture = CultureInfo.GetCultureInfo("nb-NO");

    var calendarWeekRule = culture.DateTimeFormat.CalendarWeekRule.Dump();
    var firstDayOfWeek = culture.DateTimeFormat.FirstDayOfWeek.Dump();

    var date = new DateTime(2018, 12, 31);
    $"{date.DayOfWeek} {date}, week {culture.Calendar.GetWeekOfYear(date, calendarWeekRule, firstDayOfWeek)}".Dump();

    date = new DateTime(2019, 1, 1);
    $"{date.DayOfWeek} {date}, week {culture.Calendar.GetWeekOfYear(date, calendarWeekRule, firstDayOfWeek)}".Dump();
}

输出:

FirstFourDayWeek
Monday
Monday 31.12.2018 00.00.00, week 53
Tuesday 01.01.2019 00.00.00, week 1

那里的星期一与2019年的第一周在同一周,在挪威被算作2019年的第一周,所以两个日期中的第一个应该是:

Monday 31.12.2018 00.00.00, week 1