GregorianCalendar.AddMonths(DateTime, Int32) 方法

参考

定义

命名空间:: System.Globalization

程序集:: mscorlib.dll, System.Globalization.Calendars.dll

程序集:: System.Runtime.dll

程序集:: System.Globalization.Calendars.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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返回与指定 DateTime 相距指定月数的 DateTime。

public:
 override DateTime AddMonths(DateTime time, int months);

public override DateTime AddMonths (DateTime time, int months);

override this.AddMonths : DateTime * int -> DateTime

Public Overrides Function AddMonths (time As DateTime, months As Integer) As DateTime

参数

time: DateTime

将向其添加月数的 DateTime。

months: Int32

要添加的月数。

DateTime

将指定月数添加到指定的 DateTime 中时得到的 DateTime。

例外

ArgumentException

生成的 DateTime 超出了支持的范围。

ArgumentOutOfRangeException

months 小于 -120000。

或 - months 大于 120000。

示例

下面的代码示例显示公历的多个组件 DateTime 的值。

using namespace System;
using namespace System::Globalization;
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();
}

int main()
{
   
   // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
   DateTime myDT = DateTime(2002,4,3,gcnew GregorianCalendar);
   
   // Creates an instance of the GregorianCalendar.
   GregorianCalendar^ myCal = gcnew GregorianCalendar;
   
   // Displays the values of the DateTime.
   Console::WriteLine( "April 3, 2002 of the Gregorian calendar:" );
   DisplayValues( myCal, myDT );
   
   // Adds two years and ten months.
   myDT = myCal->AddYears( myDT, 2 );
   myDT = myCal->AddMonths( myDT, 10 );
   
   // Displays the values of the DateTime.
   Console::WriteLine( "After adding two years and ten months:" );
   DisplayValues( myCal, myDT );
}

/*
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

After adding two years and ten months:
   Era:        1
   Year:       2005
   Month:      2
   DayOfYear:  34
   DayOfMonth: 3
   DayOfWeek:  Thursday

*/

using System;
using System.Globalization;

public class SamplesGregorianCalendar  {

   public static void Main()  {

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

      // Creates an instance of the GregorianCalendar.
      GregorianCalendar myCal = new GregorianCalendar();

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

      // Adds two years and ten months.
      myDT = myCal.AddYears( myDT, 2 );
      myDT = myCal.AddMonths( myDT, 10 );

      // Displays the values of the DateTime.
      Console.WriteLine( "After adding two years and ten months:" );
      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();
   }
}

/*
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

After adding two years and ten months:
   Era:        1
   Year:       2005
   Month:      2
   DayOfYear:  34
   DayOfMonth: 3
   DayOfWeek:  Thursday

*/

Imports System.Globalization


Public Class SamplesGregorianCalendar   

   Public Shared Sub Main()

      ' Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      Dim myDT As New DateTime(2002, 4, 3, New GregorianCalendar())

      ' Creates an instance of the GregorianCalendar.
      Dim myCal As New GregorianCalendar()

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

      ' Adds two years and ten months.
      myDT = myCal.AddYears(myDT, 2)
      myDT = myCal.AddMonths(myDT, 10)

      ' Displays the values of the DateTime.
      Console.WriteLine("After adding two years and ten months:")
      DisplayValues(myCal, myDT)

   End Sub

   Public Shared Sub DisplayValues(myCal As Calendar, myDT As DateTime)
      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()
   End Sub

End Class


'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
'
'After adding two years and ten months:
'   Era:        1
'   Year:       2005
'   Month:      2
'   DayOfYear:  34
'   DayOfMonth: 3
'   DayOfWeek:  Thursday

注解

如果生成的日期不是结果年份的结果月份中的有效日期，则生成的日期部分 DateTime 将受到影响。它更改为生成的年份中最后一个有效日期。如果生成的月份超出指定DateTime年份，则生成的DateTime年份部分将受到影响。此实现仅支持当前时代。因此， ArgumentException 如果生成的年份超出指定 DateTime时代，则引发该年份。结果 DateTime 的一天时间部分与指定的 DateTime时间相同。

例如，如果指定月份为 10 月，则指定日期为该月的第 31 天，参数的值为 months 6，则生成的年份大于指定年份，生成的月份为 4 月，生成的日期为 4 月的第 30 天，这是 4 月的最后一天。

如果参数的值为负值，则生成的结果monthsDateTime早于指定的DateTime值。

Kind返回DateTime值的属性始终等于 DateTimeKind.Unspecified。可以通过调用DateTime.SpecifyKind该方法来保留Kind参数的属性time，如以下示例所示。

returnTime = DateTime.SpecifyKind(cal.AddMonths(time, months), time.Kind);

returnTime = DateTime.SpecifyKind(cal.AddMonths(time, months), time.Kind)

适用于

GregorianCalendar.AddMonths(DateTime, Int32) 方法

定义

参数

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例外

示例

注解

适用于

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