/// <summary>
/// <paramref name="weekRule"/>, <paramref name="firstDayOfWeek"/>에 해당하는 <see cref="WeekOfYearRuleKind"/>를 판단합니다.
/// </summary>
/// <param name="weekRule">한해의 첫주를 산정하는 규칙</param>
/// <param name="firstDayOfWeek">한주의 첫번째 요일</param>
public static WeekOfYearRuleKind GetWeekOfYearRuleKind(CalendarWeekRule? weekRule = null,
DayOfWeek? firstDayOfWeek = null) {
if(weekRule.GetValueOrDefault(DateTimeFormatInfo.CurrentInfo.CalendarWeekRule) == CalendarWeekRule.FirstFourDayWeek &&
firstDayOfWeek.GetValueOrDefault(DateTimeFormatInfo.CurrentInfo.FirstDayOfWeek) == DayOfWeek.Monday)
return WeekOfYearRuleKind.Iso8601;
return WeekOfYearRuleKind.Calendar;
}
