DateTime.DayOfWeek プロパティ

定義

名前空間:

System

アセンブリ:

System.Runtime.dll

アセンブリ:

mscorlib.dll

アセンブリ:

netstandard.dll

このインスタンスで表される曜日を取得します。

public:
 property DayOfWeek DayOfWeek { DayOfWeek get(); };

public DayOfWeek DayOfWeek { get; }

member this.DayOfWeek : DayOfWeek

Public ReadOnly Property DayOfWeek As DayOfWeek

プロパティ値

DayOfWeek

この DateTime 値の曜日を示す列挙型定数。

例

次の例では、 DayOfWeek プロパティと列挙体を System.DayOfWeek 示します。

// This example demonstrates the DateTime.DayOfWeek property
using namespace System;
int main()
{
   
   // Assume the current culture is en-US.
   // Create a DateTime for the first of May, 2003.
   DateTime dt = DateTime(2003,5,1);
   Console::WriteLine(  "Is Thursday the day of the week for {0:d}?: {1}", dt, dt.DayOfWeek == DayOfWeek::Thursday );
   Console::WriteLine(  "The day of the week for {0:d} is {1}.", dt, dt.DayOfWeek );
}

/*
This example produces the following results:

Is Thursday the day of the week for 5/1/2003?: True
The day of the week for 5/1/2003 is Thursday.
*/

// This example demonstrates the DateTime.DayOfWeek property
open System

// Assume the current culture is en-US.
// Create a DateTime for the first of May, 2003.
let dt = DateTime(2003, 5, 1)
printfn $"Is Thursday the day of the week for {dt:d}?: {dt.DayOfWeek = DayOfWeek.Thursday}"
printfn $"The day of the week for {dt:d} is {dt.DayOfWeek}." 

// This example produces the following results:
// 
// Is Thursday the day of the week for 5/1/2003?: True
// The day of the week for 5/1/2003 is Thursday.

// This example demonstrates the DateTime.DayOfWeek property
using System;

class Sample
{
    public static void Main()
    {
// Assume the current culture is en-US.
// Create a DateTime for the first of May, 2003.
    DateTime dt = new DateTime(2003, 5, 1);
    Console.WriteLine("Is Thursday the day of the week for {0:d}?: {1}",
                       dt, dt.DayOfWeek == DayOfWeek.Thursday);
    Console.WriteLine("The day of the week for {0:d} is {1}.", dt, dt.DayOfWeek);
    }
}
/*
This example produces the following results:

Is Thursday the day of the week for 5/1/2003?: True
The day of the week for 5/1/2003 is Thursday.
*/

' This example demonstrates the DateTime.DayOfWeek property
Class Sample
   Public Shared Sub Main()
      ' Assume the current culture is en-US.
      ' Create a DateTime for the first of May, 2003.
      Dim dt As New DateTime(2003, 5, 1)
      Console.WriteLine("Is Thursday the day of the week for {0:d}?: {1}", _
                         dt, dt.DayOfWeek = DayOfWeek.Thursday)
      Console.WriteLine("The day of the week for {0:d} is {1}.", dt, dt.DayOfWeek)
   End Sub
End Class
'
'This example produces the following results:
'
'Is Thursday the day of the week for 5/1/2003?: True
'The day of the week for 5/1/2003 is Thursday.
'

注釈

列挙範囲DayOfWeek.SundayDayOfWeek.Saturdayの定数DayOfWeekの値。 整数にキャストした場合、その値は 0 (示す DayOfWeek.Sunday) から 6 (示す DayOfWeek.Saturday) までの範囲です。

このプロパティは DayOfWeek 列挙定数を返します。システムの地域と言語の設定は反映されません。 特定の日付のローカライズされた曜日名を表す文字列を取得するには、パラメーターを含むformatメソッドのいずれかのオーバーロードをToString呼び出し、それを書式設定文字列またはddddカスタム書式指定文字列にddd渡します。 詳細については、「 方法: 特定の日付から曜日を抽出する」を参照してください。

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