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X509Certificate.GetExpirationDateString Method

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

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

abstract GetExpirationDateString : unit -> string  
override GetExpirationDateString : unit -> 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.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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