2 files changed, 4 insertions, 6 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index 7d8460c6..0dd9a2e3 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -2270,6 +2270,9 @@ class Backend(object):
         generalized_time = self._ffi.gc(
             generalized_time, self._lib.ASN1_GENERALIZEDTIME_free
         )
+        return self._parse_asn1_generalized_time(generalized_time)
+
+    def _parse_asn1_generalized_time(self, generalized_time):
         time = self._asn1_string_to_ascii(
             self._ffi.cast("ASN1_STRING *", generalized_time)
         )
diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index 1376ab72..49d895bb 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -712,13 +712,8 @@ def _decode_invalidity_date(backend, inv_date):
     generalized_time = backend._ffi.gc(
         generalized_time, backend._lib.ASN1_GENERALIZEDTIME_free
     )
-    time = backend._ffi.string(
-        backend._lib.ASN1_STRING_data(
-            backend._ffi.cast("ASN1_STRING *", generalized_time)
-        )
-    ).decode("ascii")
     return x509.InvalidityDate(
-        datetime.datetime.strptime(time, "%Y%m%d%H%M%SZ")
+        backend._parse_asn1_generalized_time(generalized_time)
     )