X509Certificate.GetExpirationDateString Method ()


Returns the expiration date of this X.509v3 certificate.

Namespace:   System.Security.Cryptography.X509Certificates
Assembly:  mscorlib (in mscorlib.dll)

Public Overridable Function GetExpirationDateString As String

Return Value

Type: System.String

The expiration date for this X.509 certificate.

The expiration date is the date after which the X.509 certificate is no longer considered valid.

The GetExpirationDateString method returns a string that shows the date formatted in Short Date Pattern followed by the time formatted in Long Time Pattern. The date and time are formatted using the current culture and time zone.


This method may return a different string format on Macintosh computers, although the underlying DateTime object will represent the same value.

The following example uses the GetExpirationDateString method to get the expiration date of a certificate and displays it to the console.

Imports System
Imports System.Security.Cryptography.X509Certificates

Public Class X509

   Public Shared Sub Main()

      ' The path to the certificate.
      Dim Certificate As String = "Certificate.cer"

      ' Load the certificate into an X509Certificate object.
      Dim cert As X509Certificate = X509Certificate.CreateFromCertFile(Certificate)

      ' Get the value.
      Dim results As String = cert.GetExpirationDateString()

      ' Display the value to the console.
   End Sub  
End Class 

.NET Framework
Available since 1.1
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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