/// <summary>
/// <para>获取日期的星期编号</para>
/// <para>Use BaseDateTimeExtensions.GetDefaultCalendarRule() as default calendar rule</para>
/// <para>Use BaseDateTimeExtensions.GetDefaultFirstWeekDay() as first week day</para>
/// </summary>
/// <param name="date">Date to get week number</param>
/// <returns>Week number or -1 when error</returns>
public static int GetWeekNumber(this DateTime date)
{
return(date.GetWeekNumber(BaseDateTimeExtensions.GetDefaultCalendarRule(),
BaseDateTimeExtensions.GetDefaultFirstWeekDay()));
}
/// <summary>
/// <para>获取日期的星期编号</para>
/// <para>Use BaseDateTimeExtensions.GetDefaultCalendarRule() as default calendar rule</para>
/// </summary>
/// <param name="date">Date to get week number</param>
/// <param name="firstWeekDay">First day of week</param>
/// <returns>Week number or -1 when error</returns>
public static int GetWeekNumber(this DateTime date, DayOfWeek firstWeekDay)
{
return(date.GetWeekNumber(BaseDateTimeExtensions.GetDefaultCalendarRule(), firstWeekDay));
}