DateTime.MinValue DateTime.MinValue DateTime.MinValue DateTime.MinValue Field

定義

DateTime の最小有効値を表します。Represents the smallest possible value of DateTime. このフィールドは読み取り専用です。This field is read-only.

public: static initonly DateTime MinValue;
public static readonly DateTime MinValue;
 staticval mutable MinValue : DateTime
Public Shared ReadOnly MinValue As DateTime 

フィールド値

次の例では、インスタンス化、DateTimeコンス トラクターに渡して、オブジェクト、Int64タイマー刻みの数を表す値です。The following example instantiates a DateTime object by passing its constructor an Int64 value that represents a number of ticks. この値より大きいまたは等しいが例では、コンス トラクターを呼び出す前にによりDateTime.MinValue.Ticks以下と等しい、DateTime.MaxValue.Ticksします。Before invoking the constructor, the example ensures that this value is greater than or equal to DateTime.MinValue.Ticks and less than or equal to DateTime.MaxValue.Ticks. そうでないをスローした場合、ArgumentOutOfRangeExceptionします。If not, it throws an ArgumentOutOfRangeException.

// Attempt to assign an out-of-range value to a DateTime constructor.
long numberOfTicks = Int64.MaxValue;
DateTime validDate;

// Validate the value.
if (numberOfTicks >= DateTime.MinValue.Ticks &&
    numberOfTicks <= DateTime.MaxValue.Ticks) 
   validDate = new DateTime(numberOfTicks);
else if (numberOfTicks < DateTime.MinValue.Ticks) 
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MinValue.Ticks);      
else
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.", 
                     numberOfTicks,
                     DateTime.MaxValue.Ticks);
// The example displays the following output:
//   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.
' Attempt to assign an out-of-range value to a DateTime constructor.
Dim numberOfTicks As Long = Int64.MaxValue
Dim validDate As Date

' Validate the value.
If numberOfTicks >= Date.MinValue.Ticks And _
   numberOfTicks <= Date.MaxValue.Ticks Then
   validDate = New Date(numberOfTicks)
ElseIf numberOfTicks < Date.MinValue.Ticks Then
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MinValue.Ticks)      
Else                                                   
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MaxValue.Ticks)     
End If
' The example displays the following output:
'   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.      

注釈

この定数の値はグレゴリオ暦の 0001 年 1 月 1日 00:00:00.0000000 (UTC) に相当します。The value of this constant is equivalent to 00:00:00.0000000 UTC, January 1, 0001, in the Gregorian calendar.

MinValue 割り当てられている日時を定義する、初期化されていないDateTime変数。MinValue defines the date and time that is assigned to an uninitialized DateTime variable. 次に例を示します。The following example illustrates this.

// Define an uninitialized date.
DateTime date1 = new DateTime();
Console.Write(date1);
if (date1.Equals(DateTime.MinValue))
   Console.WriteLine("  (Equals Date.MinValue)");
// The example displays the following output:
//    1/1/0001 12:00:00 AM  (Equals Date.MinValue)
' Define an uninitialized date.
Dim date1 As Date
Console.Write(date1)
If date1.Equals(Date.MinValue) Then _
   Console.WriteLine("  (Equals Date.MinValue)")
' The example displays the following output:
'    1/1/0001 12:00:00 AM  (Equals Date.MinValue)

MinValueMaxValueプロパティを使用して、値に渡す前に、サポートされている範囲内にあることを確認、DateTimeコンス トラクター。The MinValue and MaxValue properties can be used to ensure that a value lies within the supported range before passing it to a DateTime constructor. 例のセクションのコードでは、この使用方法を示します。The code in the Example section illustrates this usage.

適用対象