internal int GetDatePart(long ticks, int part)
{
PersianCalendar.CheckTicksRange(ticks);
long numberOfDays = ticks / 864000000000L + 1L;
int year = (int)Math.Floor((double)(CalendricalCalculationsHelper.PersianNewYearOnOrBefore(numberOfDays) - PersianCalendar.PersianEpoch) / 365.242189 + 0.5) + 1;
if (part == 0)
{
return(year);
}
int ordinalDay = (int)(numberOfDays - CalendricalCalculationsHelper.GetNumberOfDays(this.ToDateTime(year, 1, 1, 0, 0, 0, 0, 1)));
if (part == 1)
{
return(ordinalDay);
}
int month = PersianCalendar.MonthFromOrdinalDay(ordinalDay);
if (part == 2)
{
return(month);
}
int num = ordinalDay - PersianCalendar.DaysInPreviousMonths(month);
if (part == 3)
{
return(num);
}
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_DateTimeParsing"));
}
/// <summary>返回指定 <see cref="T:System.DateTime" /> 对象中的纪元。</summary>
/// <returns>始终返回 <see cref="F:System.Globalization.PersianCalendar.PersianEra" />。</returns>
/// <param name="time">要读取的 <see cref="T:System.DateTime" />。</param>
/// <exception cref="T:System.ArgumentOutOfRangeException">
/// <paramref name="time" /> 参数表示的日期小于 <see cref="P:System.Globalization.PersianCalendar.MinSupportedDateTime" /> 或大于 <see cref="P:System.Globalization.PersianCalendar.MaxSupportedDateTime" />。</exception>
public override int GetEra(DateTime time)
{
PersianCalendar.CheckTicksRange(time.Ticks);
return(PersianCalendar.PersianEra);
}
