JapaneseCalendar.AddMonths(DateTime, Int32) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
public:
override DateTime AddMonths(DateTime time, int months);public override DateTime AddMonths (DateTime time, int months);override this.AddMonths : DateTime * int -> DateTimePublic Overrides Function AddMonths (time As DateTime, months As Integer) As DateTime參數
- months
- Int32
要新增的月數。
傳回
DateTime，由將指定的月數加入指定的 DateTime 所產生。
例外狀況
產生的 DateTime 在支援的範圍之外。
範例
下列程式代碼範例會根據日曆顯示的數個 DateTime 元件值。
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 JapaneseCalendar.
JapaneseCalendar^ myCal = gcnew JapaneseCalendar;
// Displays the values of the DateTime.
Console::WriteLine( "April 3, 2002 of the Gregorian calendar equals the following in the Japanese 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 equals the following in the Japanese calendar:
Era: 4
Year: 14
Month: 4
DayOfYear: 93
DayOfMonth: 3
DayOfWeek: Wednesday
After adding two years and ten months:
Era: 4
Year: 17
Month: 2
DayOfYear: 34
DayOfMonth: 3
DayOfWeek: Thursday
*/
using System;
using System.Globalization;
public class SamplesJapaneseCalendar {
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 JapaneseCalendar.
JapaneseCalendar myCal = new JapaneseCalendar();
// Displays the values of the DateTime.
Console.WriteLine( "April 3, 2002 of the Gregorian calendar equals the following in the Japanese 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 equals the following in the Japanese calendar:
Era: 4
Year: 14
Month: 4
DayOfYear: 93
DayOfMonth: 3
DayOfWeek: Wednesday
After adding two years and ten months:
Era: 4
Year: 17
Month: 2
DayOfYear: 34
DayOfMonth: 3
DayOfWeek: Thursday
*/
Imports System.Globalization
Public Class SamplesJapaneseCalendar
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 JapaneseCalendar.
Dim myCal As New JapaneseCalendar()
' Displays the values of the DateTime.
Console.WriteLine("April 3, 2002 of the Gregorian calendar equals the following in the Japanese 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 equals the following in the Japanese calendar:
' Era: 4
' Year: 14
' Month: 4
' DayOfYear: 93
' DayOfMonth: 3
' DayOfWeek: Wednesday
'
'After adding two years and ten months:
' Era: 4
' Year: 17
' Month: 2
' DayOfYear: 34
' DayOfMonth: 3
' DayOfWeek: Thursday
備註
如果產生的日期不是結果年份結果月份的有效日期，則產生的 DateTime 日期部分會受到影響。 它會變更為結果年份結果月份的最後一個有效日。 如果產生的月份超出指定的 DateTime年份，則產生的DateTime年份部分會受到影響。 如果產生的年份超出指定的 DateTime紀元，則產生的DateTime紀元部分會受到影響。 結果 DateTime 的當日時間部分會維持與指定的 DateTime相同。
例如，如果指定的月份是 Juugatsu (10 月) ，其有 31 天，則指定的日期是該月份的第 31 天，而 months 為 6，產生的年份會超過指定的年份，產生的月份會是 Shigatsu (4 月) ，而產生的日期是 30 天，也就是 Shigatsu (4 月) 。
如果 months 為負數，則產生的 DateTime 會早於指定的 DateTime。
傳 Kind 回 DateTime 值的 屬性一律等於 DateTimeKind.Unspecified。 您可以呼叫 DateTime.SpecifyKind 方法來保留 Kind 參數的 time 屬性，如下列範例所示。
returnTime = DateTime.SpecifyKind(cal.AddMonths(time, months), time.Kind);
returnTime = DateTime.SpecifyKind(cal.AddMonths(time, months), time.Kind)
