diff --git a/lemur/plugins/lemur_digicert/plugin.py b/lemur/plugins/lemur_digicert/plugin.py
index 00fe9519..5692af86 100644
--- a/lemur/plugins/lemur_digicert/plugin.py
+++ b/lemur/plugins/lemur_digicert/plugin.py
@@ -157,7 +157,7 @@ def map_cis_fields(options, csr):
         "csr": csr,
         "signature_hash": signature_hash(options.get('signing_algorithm')),
         "validity": {
-            "valid_to": options['validity_end'].format('YYYY-MM-DD')
+            "valid_to": options['validity_end'].format('YYYY-MM-DDTHH:MM:SSZ')
         },
         "organization": {
             "name": options['organization'],
diff --git a/lemur/plugins/lemur_digicert/tests/test_digicert.py b/lemur/plugins/lemur_digicert/tests/test_digicert.py
index dca24892..91f27ad4 100644
--- a/lemur/plugins/lemur_digicert/tests/test_digicert.py
+++ b/lemur/plugins/lemur_digicert/tests/test_digicert.py
@@ -103,7 +103,7 @@ def test_map_cis_fields(app):
         'signature_hash': 'sha256',
         'organization': {'name': 'Example, Inc.', 'units': ['Example Org']},
         'validity': {
-            'valid_to': arrow.get(2017, 5, 7).format('YYYY-MM-DD')
+            'valid_to': arrow.get(2017, 5, 7).format('YYYY-MM-DDTHH:MM:SSZ')
         },
         'profile_name': None
     }
@@ -132,7 +132,7 @@ def test_map_cis_fields(app):
             'signature_hash': 'sha256',
             'organization': {'name': 'Example, Inc.', 'units': ['Example Org']},
             'validity': {
-                'valid_to': arrow.get(2018, 11, 3).format('YYYY-MM-DD')
+                'valid_to': arrow.get(2018, 11, 3).format('YYYY-MM-DDTHH:MM:SSZ')
             },
             'profile_name': None
         }