Gets the time of signing. Depending on the signature handler, this may be a normal unverified computer time or a time generated in a verifiable way from a secure time server. This value should be used only when the time of signing is not available in the signature; for example, a time stamp can be embedded in a PKCS#7 binary data object (see PDF specification for more details).

'Declaration
 
Public ReadOnly Property SigningTime As System.Nullable(Of PdfDateTime)

public System.Nullable<PdfDateTime> SigningTime {get;}