/// <summary>
/// 一年多少周
/// </summary>
/// <param name="datetime">日期</param>
/// <param name="weekrule">第一周的规则</param>
/// <returns>一年多少周</returns>
public static int WeekOfYear(this DateTime datetime, System.Globalization.CalendarWeekRule weekrule)
{
System.Globalization.DateTimeFormatInfo dateinf = new System.Globalization.DateTimeFormatInfo();
DayOfWeek firstDayOfWeek = dateinf.FirstDayOfWeek;
return(WeekOfYear(datetime, weekrule, firstDayOfWeek));
}
/// <summary>
/// Get the week of year.
/// </summary>
/// <param name="date">The date value.</param>
/// <param name="rule">The calendar week rule.</param>
/// <returns>return the week of year.</returns>
public static int GetWeekOfYear(this DateTime date, System.Globalization.CalendarWeekRule rule)
{
System.Globalization.DateTimeFormatInfo dateInfo = new System.Globalization.DateTimeFormatInfo();
DayOfWeek firstDayOfWeek = dateInfo.FirstDayOfWeek;
return(GetWeekOfYear(date, rule, firstDayOfWeek));
}
/// <summary>
/// Weeks the specified td date.
/// </summary>
/// <param name="tdDate">The td date.</param>
/// <returns></returns>
private static int Week(DateTime tdDate)
{
CultureInfo ci = System.Threading.Thread.CurrentThread.CurrentCulture;
System.Globalization.Calendar Cal = ci.Calendar;
System.Globalization.CalendarWeekRule CWR = ci.DateTimeFormat.CalendarWeekRule;
DayOfWeek FirstDOW = ci.DateTimeFormat.FirstDayOfWeek;
return(Cal.GetWeekOfYear(tdDate, CWR, FirstDOW));
}
/// <summary>
/// 一年多少周
/// </summary>
/// <param name="datetime">日期</param>
/// <param name="weekrule">第一周的规则</param>
/// <param name="firstDayOfWeek">星期几</param>
/// <returns>一年多少周</returns>
public static int WeekOfYear(this DateTime datetime, System.Globalization.CalendarWeekRule weekrule, DayOfWeek firstDayOfWeek)
{
System.Globalization.CultureInfo ciCurr = System.Globalization.CultureInfo.CurrentCulture;
return(ciCurr.Calendar.GetWeekOfYear(datetime, weekrule, firstDayOfWeek));
}
