Time String Types The ASN.1 GeneralizedTime and UTCTime types are mapped to the XSD dateTime type. ASN.1 production: TypeName ::= ASN1TimeStringType in this definition, ASN1TimeStringType would be replaced with either GeneralizedTime or UTCTime. Generated XSD code: <xsd:simpleType name="TypeName"> <xsd:restriction base="xsd:dateTime"/> </xsd:simpleType>