DateTime.MinValue Campo

Definición

Representa el menor valor posible de DateTime.Represents the smallest possible value of DateTime. Este campo es de solo lectura.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 

Valor de campo

Ejemplos

En el ejemplo siguiente se crea una instancia de un objeto DateTime pasando a su constructor un valor Int64 que representa un número de pasos.The following example instantiates a DateTime object by passing its constructor an Int64 value that represents a number of ticks. Antes de invocar el constructor, el ejemplo garantiza que este valor es mayor o igual que DateTime.MinValue.Ticks y menor o igual que DateTime.MaxValue.Ticks.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. Si no es así, se produce una excepción ArgumentOutOfRangeException.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.      

Comentarios

El valor de esta constante es equivalente a 00:00:00.0000000 UTC, 1 de enero de 0001, en el calendario gregoriano.The value of this constant is equivalent to 00:00:00.0000000 UTC, January 1, 0001, in the Gregorian calendar.

MinValue define la fecha y hora asignadas a una variable de DateTime no inicializada.MinValue defines the date and time that is assigned to an uninitialized DateTime variable. Esto se ilustra en el siguiente ejemplo: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)

Se pueden usar las propiedades MinValue y MaxValue para asegurarse de que un valor se encuentra dentro del intervalo admitido antes de pasarlo a un constructor DateTime.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. En el código de la sección de ejemplo se muestra este uso.The code in the Example section illustrates this usage.

Se aplica a