/// <inheritdoc />
public int GetWeeksInWeekYear(int weekYear, CalendarSystem calendar)
{
Preconditions.CheckNotNull(calendar, nameof(calendar));
YearMonthDayCalculator yearMonthDayCalculator = calendar.YearMonthDayCalculator;
ValidateWeekYear(weekYear, calendar);
unchecked
{
int startOfWeekYear = GetWeekYearDaysSinceEpoch(yearMonthDayCalculator, weekYear);
int startOfCalendarYear = yearMonthDayCalculator.GetStartOfYearInDays(weekYear);
// The number of days gained or lost in the week year compared with the calendar year.
// So if the week year starts on December 31st of the previous calendar year, this will be +1.
// If the week year starts on January 2nd of this calendar year, this will be -1.
int extraDaysAtStart = startOfCalendarYear - startOfWeekYear;
// At the end of the year, we may have some extra days too.
// In a non-regular rule, we just round up, so assume we effectively have 6 extra days.
// In a regular rule, there can be at most minDaysInFirstWeek - 1 days "borrowed"
// from the following year - because if there were any more, those days would be in the
// the following year instead.
int extraDaysAtEnd = irregularWeeks ? 6 : minDaysInFirstWeek - 1;
int daysInThisYear = yearMonthDayCalculator.GetDaysInYear(weekYear);
// We can have up to "minDaysInFirstWeek - 1" days of the next year, too.
return((daysInThisYear + extraDaysAtStart + extraDaysAtEnd) / 7);
}
}
/// <inheritdoc />
public int GetWeeksInWeekYear(int weekYear, [NotNull] CalendarSystem calendar)
{
Preconditions.CheckNotNull(calendar, nameof(calendar));
YearMonthDayCalculator yearMonthDayCalculator = calendar.YearMonthDayCalculator;
ValidateWeekYear(weekYear, calendar);
unchecked
{
int startOfWeekYear = GetWeekYearDaysSinceEpoch(yearMonthDayCalculator, weekYear);
int startOfCalendarYear = yearMonthDayCalculator.GetStartOfYearInDays(weekYear);
// The number of days gained or lost in the week year compared with the calendar year.
// So if the week year starts on December 31st of the previous calendar year, this will be +1.
// If the week year starts on January 2nd of this calendar year, this will be -1.
int extraDaysAtStart = startOfCalendarYear - startOfWeekYear;
// At the end of the year, we may have some extra days too.
// In a non-regular rule, we just round up, so assume we effectively have 6 extra days.
// TODO: Explain the reasoning for the regular rule part. I know it works, I just
// don't know why.
int extraDaysAtEnd = irregularWeeks ? 6: minDaysInFirstWeek - 1;
int daysInThisYear = yearMonthDayCalculator.GetDaysInYear(weekYear);
// We can have up to "minDaysInFirstWeek - 1" days of the next year, too.
return((daysInThisYear + extraDaysAtStart + extraDaysAtEnd) / 7);
}
}
private int GetWeeksInWeekYear(int weekYear)
{
long startOfWeekYear = GetWeekYearTicks(weekYear);
long startOfCalendarYear = yearMonthDayCalculator.GetStartOfYearInTicks(weekYear);
// The number of days gained or lost in the week year compared with the calendar year.
// So if the week year starts on December 31st of the previous calendar year, this will be +1.
// If the week year starts on January 2nd of this calendar year, this will be -1.
int extraDays = (int)((startOfCalendarYear - startOfWeekYear) / NodaConstants.TicksPerStandardDay);
int daysInThisYear = yearMonthDayCalculator.GetDaysInYear(weekYear);
// We can have up to "minDaysInFirstWeek - 1" days of the next year, too.
return((daysInThisYear + extraDays + (minDaysInFirstWeek - 1)) / 7);
}
private int GetWeeksInWeekYear([Trusted] int weekYear)
{
unchecked
{
int startOfWeekYear = GetWeekYearDaysSinceEpoch(weekYear);
int startOfCalendarYear = yearMonthDayCalculator.GetStartOfYearInDays(weekYear);
// The number of days gained or lost in the week year compared with the calendar year.
// So if the week year starts on December 31st of the previous calendar year, this will be +1.
// If the week year starts on January 2nd of this calendar year, this will be -1.
int extraDays = startOfCalendarYear - startOfWeekYear;
int daysInThisYear = yearMonthDayCalculator.GetDaysInYear(weekYear);
// We can have up to "minDaysInFirstWeek - 1" days of the next year, too.
return((daysInThisYear + extraDays + (minDaysInFirstWeek - 1)) / 7);
}
}
/// <inheritdoc />
public int GetWeeksInWeekYear(int weekYear, [NotNull] CalendarSystem calendar)
{
Preconditions.CheckNotNull(calendar, nameof(calendar));
YearMonthDayCalculator yearMonthDayCalculator = calendar.YearMonthDayCalculator;
ValidateWeekYear(weekYear, calendar);
unchecked
{
int startOfWeekYear = GetWeekYearDaysSinceEpoch(yearMonthDayCalculator, weekYear);
int startOfCalendarYear = yearMonthDayCalculator.GetStartOfYearInDays(weekYear);
// The number of days gained or lost in the week year compared with the calendar year.
// So if the week year starts on December 31st of the previous calendar year, this will be +1.
// If the week year starts on January 2nd of this calendar year, this will be -1.
int extraDays = startOfCalendarYear - startOfWeekYear;
int daysInThisYear = yearMonthDayCalculator.GetDaysInYear(weekYear);
// We can have up to "minDaysInFirstWeek - 1" days of the next year, too.
return((daysInThisYear + extraDays + (minDaysInFirstWeek - 1)) / 7);
}
}