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Calendar.AddWeeks Method

Returns a DateTime that is the specified number of weeks away from the specified DateTime.

Namespace: System.Globalization
Assembly: mscorlib (in mscorlib.dll)

public virtual DateTime AddWeeks (
	DateTime time,
	int weeks
)
public DateTime AddWeeks (
	DateTime time, 
	int weeks
)
public function AddWeeks (
	time : DateTime, 
	weeks : int
) : DateTime

Parameters

time

The DateTime to which to add weeks.

weeks

The number of weeks to add.

Return Value

The DateTime that results from adding the specified number of weeks to the specified DateTime.
Exception typeCondition

ArgumentException

The resulting DateTime is outside the supported range of this calendar.

ArgumentOutOfRangeException

weeks itself is outside the supported range of the DateTime return value.

The weeks value is added to the specified DateTime. If weeks is negative, the resulting DateTime is earlier than the specified DateTime.

The month part of the resulting DateTime is affected if the resulting day is outside the month of the specified DateTime. The year part of the resulting DateTime is affected if the resulting month is outside the year of the specified DateTime. The era part of the resulting DateTime is affected if the resulting year is outside the era of the specified DateTime. The time-of-day part of the resulting DateTime remains the same as the specified DateTime.

In all .NET Framework classes derived from the Calendar class, a week is defined as seven days.

The following code example demonstrates the members of the Calendar class.

using System;
using System.Globalization;


public class SamplesCalendar  {

   public static void Main()  {

      // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      DateTime myDT = new DateTime( 2002, 4, 3, new GregorianCalendar() );

      // Uses the default calendar of the InvariantCulture.
      Calendar myCal = CultureInfo.InvariantCulture.Calendar;

      // Displays the values of the DateTime.
      Console.WriteLine( "April 3, 2002 of the Gregorian calendar:" );
      DisplayValues( myCal, myDT );

      // Adds 5 to every component of the DateTime.
      myDT = myCal.AddYears( myDT, 5 );
      myDT = myCal.AddMonths( myDT, 5 );
      myDT = myCal.AddWeeks( myDT, 5 );
      myDT = myCal.AddDays( myDT, 5 );
      myDT = myCal.AddHours( myDT, 5 );
      myDT = myCal.AddMinutes( myDT, 5 );
      myDT = myCal.AddSeconds( myDT, 5 );
      myDT = myCal.AddMilliseconds( myDT, 5 );

      // Displays the values of the DateTime.
      Console.WriteLine( "After adding 5 to each component of the DateTime:" );
      DisplayValues( myCal, myDT );

   }

   public static void DisplayValues( Calendar myCal, DateTime myDT )  {
      Console.WriteLine( "   Era:          {0}", myCal.GetEra( myDT ) );
      Console.WriteLine( "   Year:         {0}", myCal.GetYear( myDT ) );
      Console.WriteLine( "   Month:        {0}", myCal.GetMonth( myDT ) );
      Console.WriteLine( "   DayOfYear:    {0}", myCal.GetDayOfYear( myDT ) );
      Console.WriteLine( "   DayOfMonth:   {0}", myCal.GetDayOfMonth( myDT ) );
      Console.WriteLine( "   DayOfWeek:    {0}", myCal.GetDayOfWeek( myDT ) );
      Console.WriteLine( "   Hour:         {0}", myCal.GetHour( myDT ) );
      Console.WriteLine( "   Minute:       {0}", myCal.GetMinute( myDT ) );
      Console.WriteLine( "   Second:       {0}", myCal.GetSecond( myDT ) );
      Console.WriteLine( "   Milliseconds: {0}", myCal.GetMilliseconds( myDT ) );
      Console.WriteLine();
   }

}


/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar:
   Era:          1
   Year:         2002
   Month:        4
   DayOfYear:    93
   DayOfMonth:   3
   DayOfWeek:    Wednesday
   Hour:         0
   Minute:       0
   Second:       0
   Milliseconds: 0

After adding 5 to each component of the DateTime:
   Era:          1
   Year:         2007
   Month:        10
   DayOfYear:    286
   DayOfMonth:   13
   DayOfWeek:    Saturday
   Hour:         5
   Minute:       5
   Second:       5
   Milliseconds: 5

*/

import System.* ;
import System.Globalization.* ;

public class SamplesCalendar
{
    public static void main(String[] args)
    {
        // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
        DateTime myDT =  new DateTime(2002, 4, 3, new GregorianCalendar());

        // Uses the default calendar of the InvariantCulture.
        Calendar myCal = CultureInfo.get_InvariantCulture().get_Calendar();

        // Displays the values of the DateTime.
        Console.WriteLine("April 3, 2002 of the Gregorian calendar:");
        DisplayValues(myCal, myDT);

        // Adds 5 to every component of the DateTime.
        myDT = myCal.AddYears(myDT, 5);
        myDT = myCal.AddMonths(myDT, 5);
        myDT = myCal.AddWeeks(myDT, 5);
        myDT = myCal.AddDays(myDT, 5);
        myDT = myCal.AddHours(myDT, 5);
        myDT = myCal.AddMinutes(myDT, 5);
        myDT = myCal.AddSeconds(myDT, 5);
        myDT = myCal.AddMilliseconds(myDT, 5);

        // Displays the values of the DateTime.
        Console.WriteLine("After adding 5 to each component of the DateTime:");
        DisplayValues(myCal, myDT);
    } //main
   
    public static void DisplayValues(Calendar myCal, DateTime myDT)
    {
        Console.WriteLine("   Era:          {0}", 
            System.Convert.ToString(myCal.GetEra(myDT)));
        Console.WriteLine("   Year:         {0}", 
            System.Convert.ToString(myCal.GetYear(myDT)));
        Console.WriteLine("   Month:        {0}", 
            System.Convert.ToString(myCal.GetMonth(myDT)));
        Console.WriteLine("   DayOfYear:    {0}", 
            System.Convert.ToString(myCal.GetDayOfYear(myDT)));
        Console.WriteLine("   DayOfMonth:   {0}", 
            System.Convert.ToString(myCal.GetDayOfMonth(myDT)));
        Console.WriteLine("   DayOfWeek:    {0}",
            System.Convert.ToString(myCal.GetDayOfWeek(myDT)));
        Console.WriteLine("   Hour:         {0}",
            System.Convert.ToString(myCal.GetHour(myDT)));
        Console.WriteLine("   Minute:       {0}",
            System.Convert.ToString(myCal.GetMinute(myDT)));
        Console.WriteLine("   Second:       {0}", 
            System.Convert.ToString(myCal.GetSecond(myDT)));
        Console.WriteLine("   Milliseconds: {0}", 
            System.Convert.ToString(myCal.GetMilliseconds(myDT)));
        Console.WriteLine();
    } //DisplayValues
} //SamplesCalendar

/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar:
   Era:          1
   Year:         2002
   Month:        4
   DayOfYear:    93
   DayOfMonth:   3
   DayOfWeek:    Wednesday
   Hour:         0
   Minute:       0
   Second:       0
   Milliseconds: 0

After adding 5 to each component of the DateTime:
   Era:          1
   Year:         2007
   Month:        10
   DayOfYear:    286
   DayOfMonth:   13
   DayOfWeek:    Saturday
   Hour:         5
   Minute:       5
   Second:       5
   Milliseconds: 5
*/

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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