HijriCalendar.AddMonths(DateTime, Int32) 方法
定义
重要
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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参数
- months
- Int32
要添加的月数。
返回
将指定月数添加到指定的 DateTime 中时得到的 DateTime。
例外
示例
下面的代码示例根据回历显示 的 DateTime 多个组件的值。
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 HijriCalendar.
HijriCalendar^ myCal = gcnew HijriCalendar;
// Displays the values of the DateTime.
Console::WriteLine( "April 3, 2002 of the Gregorian calendar equals the following in the Hijri 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 Hijri calendar:
Era: 1
Year: 1423
Month: 1
DayOfYear: 21
DayOfMonth: 21
DayOfWeek: Wednesday
After adding two years and ten months:
Era: 1
Year: 1425
Month: 11
DayOfYear: 316
DayOfMonth: 21
DayOfWeek: Saturday
*/
using System;
using System.Globalization;
public class SamplesHijriCalendar {
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 HijriCalendar.
HijriCalendar myCal = new HijriCalendar();
// Displays the values of the DateTime.
Console.WriteLine( "April 3, 2002 of the Gregorian calendar equals the following in the Hijri 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 Hijri calendar:
Era: 1
Year: 1423
Month: 1
DayOfYear: 21
DayOfMonth: 21
DayOfWeek: Wednesday
After adding two years and ten months:
Era: 1
Year: 1425
Month: 11
DayOfYear: 316
DayOfMonth: 21
DayOfWeek: Saturday
*/
Imports System.Globalization
Public Class SamplesHijriCalendar
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 HijriCalendar.
Dim myCal As New HijriCalendar()
' Displays the values of the DateTime.
Console.WriteLine("April 3, 2002 of the Gregorian calendar equals the following in the Hijri 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 Hijri calendar:
' Era: 1
' Year: 1423
' Month: 1
' DayOfYear: 21
' DayOfMonth: 21
' DayOfWeek: Wednesday
'
'After adding two years and ten months:
' Era: 1
' Year: 1425
' Month: 11
' DayOfYear: 316
' DayOfMonth: 21
' DayOfWeek: Saturday
注解
如果生成的日期不是结果 DateTime 年份的月中的有效日期，则结果的日期部分将受到影响。 它更改为结果年份的结果月份中的最后一个有效日期。 如果生成的月份在指定 DateTime的年份之外，则结果DateTime的年份部分将受到影响。 此实现仅支持当前纪元。 因此， ArgumentException 如果生成的年份在指定 DateTime的纪元之外，则会引发 。 生成的 DateTime 的一天中的时间部分与指定的 DateTime保持相同。
例如，如果指定的月份是 Zulkadah，它有 30 天，指定的日期是该月的第 30 天，参数的 months 值为 3，则生成的年份比指定的年份多一，生成的月份为 Safar，生成的日期为第 29 天，这是 Safar 中的最后一天。
如果 参数的 months 值为负值，则生成的 DateTime 早于指定的 DateTime。
Kind返回DateTime值的 属性始终等于 DateTimeKind.Unspecified。 可以通过调用 DateTime.SpecifyKind 方法保留 Kind 参数的 time 属性，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)
