Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Método

Definición

Espacio de nombres:

System.Globalization

Ensamblado:

System.Runtime.dll

Source:

Calendar.cs

Devuelve la semana del año que incluye la fecha en el valor DateTime especificado.

public:
 virtual int GetWeekOfYear(DateTime time, System::Globalization::CalendarWeekRule rule, DayOfWeek firstDayOfWeek);

public virtual int GetWeekOfYear (DateTime time, System.Globalization.CalendarWeekRule rule, DayOfWeek firstDayOfWeek);

abstract member GetWeekOfYear : DateTime * System.Globalization.CalendarWeekRule * DayOfWeek -> int
override this.GetWeekOfYear : DateTime * System.Globalization.CalendarWeekRule * DayOfWeek -> int

Public Overridable Function GetWeekOfYear (time As DateTime, rule As CalendarWeekRule, firstDayOfWeek As DayOfWeek) As Integer

Parámetros

time

DateTime

Valor de fecha y hora.

rule

CalendarWeekRule

Valor de enumeración que define una semana del calendario.

firstDayOfWeek

DayOfWeek

Valor de enumeración que representa el primer día de la semana.

Devoluciones

Int32

Un entero positivo que representa la semana del año que incluye la fecha del parámetro time.

Excepciones

ArgumentOutOfRangeException

time es anterior que MinSupportedDateTime o posterior que MaxSupportedDateTime.

o bien

firstDayOfWeek no es un valor DayOfWeek válido.

o bien

rule no es un valor CalendarWeekRule válido.

Ejemplos

En el ejemplo de código siguiente se muestra cómo varía el resultado de en función de GetWeekOfYear y FirstDayOfWeek del CalendarWeekRule utilizado. Si la fecha especificada es el último día del año, GetWeekOfYear devuelve el número total de semanas de ese año.

using namespace System;
using namespace System::Globalization;
int main()
{
   
   // Gets the Calendar instance associated with a CultureInfo.
   CultureInfo^ myCI = gcnew CultureInfo( "en-US" );
   Calendar^ myCal = myCI->Calendar;
   
   // Gets the DTFI properties required by GetWeekOfYear.
   CalendarWeekRule myCWR = myCI->DateTimeFormat->CalendarWeekRule;
   DayOfWeek myFirstDOW = myCI->DateTimeFormat->FirstDayOfWeek;
   
   // Displays the number of the current week relative to the beginning of the year.
   Console::WriteLine( "The CalendarWeekRule used for the en-US culture is {0}.", myCWR );
   Console::WriteLine( "The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW );
   Console::WriteLine( "Therefore, the current week is Week {0} of the current year.", myCal->GetWeekOfYear( DateTime::Now, myCWR, myFirstDOW ) );
   
   // Displays the total number of weeks in the current year.
   DateTime LastDay = System::DateTime( DateTime::Now.Year, 12, 31 );
   Console::WriteLine( "There are {0} weeks in the current year ( {1}).", myCal->GetWeekOfYear( LastDay, myCWR, myFirstDOW ), LastDay.Year );
}

/*
This code produces the following output.  Results vary depending on the system date.

The CalendarWeekRule used for the en-US culture is FirstDay.
The FirstDayOfWeek used for the en-US culture is Sunday.
Therefore, the current week is Week 1 of the current year.
There are 53 weeks in the current year (2001).
*/

using System;
using System.Globalization;

public class SamplesCalendar  {

   public static void Main()  {

      // Gets the Calendar instance associated with a CultureInfo.
      CultureInfo myCI = new CultureInfo("en-US");
      Calendar myCal = myCI.Calendar;

      // Gets the DTFI properties required by GetWeekOfYear.
      CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;
      DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;

      // Displays the number of the current week relative to the beginning of the year.
      Console.WriteLine( "The CalendarWeekRule used for the en-US culture is {0}.", myCWR );
      Console.WriteLine( "The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW );
      Console.WriteLine( "Therefore, the current week is Week {0} of the current year.", myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW ));

      // Displays the total number of weeks in the current year.
      DateTime LastDay = new System.DateTime( DateTime.Now.Year, 12, 31 );
      Console.WriteLine( "There are {0} weeks in the current year ({1}).", myCal.GetWeekOfYear( LastDay, myCWR, myFirstDOW ), LastDay.Year );
   }
}

/*
This code produces the following output.  Results vary depending on the system date.

The CalendarWeekRule used for the en-US culture is FirstDay.
The FirstDayOfWeek used for the en-US culture is Sunday.
Therefore, the current week is Week 1 of the current year.
There are 53 weeks in the current year (2001).

*/

Imports System.Globalization

Public Class SamplesCalendar

   Public Shared Sub Main()
      
      ' Gets the Calendar instance associated with a CultureInfo.
      Dim myCI As New CultureInfo("en-US")
      Dim myCal As Calendar = myCI.Calendar
      
      ' Gets the DTFI properties required by GetWeekOfYear.
      Dim myCWR As CalendarWeekRule = myCI.DateTimeFormat.CalendarWeekRule
      Dim myFirstDOW As DayOfWeek = myCI.DateTimeFormat.FirstDayOfWeek
      
      ' Displays the number of the current week relative to the beginning of the year.
      Console.WriteLine("The CalendarWeekRule used for the en-US culture is {0}.", myCWR)
      Console.WriteLine("The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW)
      Console.WriteLine("Therefore, the current week is Week {0} of the current year.", myCal.GetWeekOfYear(DateTime.Now, myCWR, myFirstDOW))
      
      ' Displays the total number of weeks in the current year.
      Dim LastDay = New System.DateTime(DateTime.Now.Year, 12, 31)
      Console.WriteLine("There are {0} weeks in the current year ({1}).", myCal.GetWeekOfYear(LastDay, myCWR, myFirstDOW), LastDay.Year)
   End Sub
End Class


'This code produces the following output.  Results vary depending on the system date.
'
'The CalendarWeekRule used for the en-US culture is FirstDay.
'The FirstDayOfWeek used for the en-US culture is Sunday.
'Therefore, the current week is Week 1 of the current year.
'There are 53 weeks in the current year (2001).

Comentarios

Este método se puede usar para determinar el número de semanas del año estableciendo time en el último día del año.

El DateTimeFormatInfo objeto de una referencia cultural determinada que usa el calendario indicado por la DateTimeFormatInfo.Calendar propiedad incluye los siguientes valores específicos de la referencia cultural que se pueden usar para los rule parámetros y firstDayOfWeek :

• La DateTimeFormatInfo.FirstDayOfWeek propiedad contiene el primer día predeterminado de la semana que se puede usar para el firstDayOfWeek parámetro .

• La DateTimeFormatInfo.CalendarWeekRule propiedad contiene la regla de semana natural predeterminada que se puede usar para el rule parámetro .

Nota

Esto no se asigna exactamente a ISO 8601. Las diferencias se describen en la entrada de blog FORMATO ISO 8601 Week of Year en Microsoft .NET. A partir de .NET Core 3.0 ISOWeek.GetYear y ISOWeek.GetWeekOfYear solucionar este problema.

En el ejemplo siguiente se usa el objeto de DateTimeFormatInfo la referencia cultural actual para determinar que el 1 de enero de 2011 se encuentra en la primera semana del año en el calendario gregoriano.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      DateTimeFormatInfo dfi = DateTimeFormatInfo.CurrentInfo;
      DateTime date1 = new DateTime(2011, 1, 1);
      Calendar cal = dfi.Calendar;

      Console.WriteLine("{0:d}: Week {1} ({2})", date1,
                        cal.GetWeekOfYear(date1, dfi.CalendarWeekRule,
                                          dfi.FirstDayOfWeek),
                        cal.ToString().Substring(cal.ToString().LastIndexOf(".") + 1));
   }
}
// The example displays the following output:
//       1/1/2011: Week 1 (GregorianCalendar)

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim dfi As DateTimeFormatInfo = DateTimeFormatInfo.CurrentInfo
      Dim date1 As Date = #1/1/2011#
      Dim cal As Calendar = dfi.Calendar
      
      Console.WriteLine("{0:d}: Week {1} ({2})", date1, 
                        cal.GetWeekOfYear(date1, dfi.CalendarWeekRule, 
                                          dfi.FirstDayOfWeek),
                        cal.ToString().Substring(cal.ToString().LastIndexOf(".") + 1))       
   End Sub
End Module
' The example displays the following output:
'       1/1/2011: Week 1 (GregorianCalendar)

Para algunos calendarios, una llamada al GetWeekOfYear método produce una ArgumentOutOfRangeException para combinaciones concretas de rule valores y firstDayOfWeek incluso si time es mayor que la fecha devuelta por la propiedad de MinSupportedDateTime ese calendario. En la tabla siguiente se enumeran los calendarios afectados, los valores específicos rule y el intervalo de los valores admitidos más antiguos time . El valor mínimo DateTime específico depende del valor del firstDayOfWeek parámetro .

Calendario	Valor calendarWeekRule	Fecha gregoriana (M/dd/aaaa)	Fecha en el calendario (M/dd/aaaa)
ChineseLunisolarCalendar	FirstFullWeek	19/2/1901 a 2/25/1901	1/1/1901 a 1/7/1901
ChineseLunisolarCalendar	FirstFourDayWeek	19/2/1901 al 2/22/1901	1/01/1901 a 1/04/1901
HebrewCalendar	FirstDay	9/17/1583	1/01/5344
HebrewCalendar	FirstFullWeek	17/9/1583 al 23/9/1583	1/01/5344 a 1/07/5344
HebrewCalendar	FirstFourDayWeek	17/9/1583 al 20/9/1583	1/01/5344 a 1/04/5344
HijriCalendar	FirstFullWeek	18/7/0622 al 24/7/0622	1/01/0001 a 1/07/0001
HijriCalendar	FirstFourDayWeek	18/7/0622 al 21/7/0622	1/01/0001 a 1/04/0001
JapaneseLunisolarCalendar	FirstFullWeek	28/1960 al 2/03/1960	1/01/35 a 1/07/0035
JapaneseLunisolarCalendar	FirstFourDayWeek	28/1960/1/1/31/1960	1/01/0035 a 1/04/0035
JulianCalendar	FirstFullWeek	1/01/0001 a 1/05/0001	1/03/0001 a 1/07/0001
JulianCalendar	FirstFourDayWeek	1/01/0001 a 1/02/0001	1/03/0001 a 1/04/0001
KoreanLunisolarCalendar	FirstFullWeek	14/2/0918 al 2/20/0918	1/01/0918 a 1/07/0918
KoreanLunisolarCalendar	FirstFourDayWeek	14/2/0918 al 17/2/0918	1/01/0918 a 1/04/0918
PersianCalendar	FirstFullWeek	21/3/0622 al 27/3/0622	1/01/0001 a 1/07/0001
PersianCalendar	FirstFourDayWeek	21/3/0622 al 24/3/0622	1/01/0001 a 1/04/0001
TaiwanLunisolarCalendar	FirstFullWeek	18/2/1912 a 2/24/1912	1/01/0001 a 1/07/0001
TaiwanLunisolarCalendar	FirstFourDayWeek	18/2/1912 al 2/21/1912	1/01/0001 a 1/04/0001
UmAlQuraCalendar	FirstFullWeek	30/4/1900 a 5/06/1900	1/01/1318 a 1/07/1318
UmAlQuraCalendar	FirstFourDayWeek	30/4/1900 a 5/03/1900	1/01/1318 a 1/04/1318

Consulte también

• DateTime
• CalendarWeekRule
• DayOfWeek
• GetEra(DateTime)
• GetYear(DateTime)
• GetMonth(DateTime)
• GetDayOfYear(DateTime)
• GetDayOfMonth(DateTime)
• GetDayOfWeek(DateTime)
• GetHour(DateTime)
• GetMinute(DateTime)
• GetSecond(DateTime)
• GetMilliseconds(DateTime)