diff --git a/tests/draft-next/optional/format/date.json b/tests/draft-next/optional/format/date.json
index 75c6146d..f3629788 100644
--- a/tests/draft-next/optional/format/date.json
+++ b/tests/draft-next/optional/format/date.json
@@ -220,6 +220,26 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4)",
                 "data": "1963-06-1৪",
                 "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: YYYYMMDD without dashes (2023-03-28)",
+                "data": "20230328",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number implicit day of week (2023-01-02)",
+                "data": "2023-W01",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number with day of week (2023-03-28)",
+                "data": "2023-W13-2",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number + day of week + rollover to next year (2023-01-01)",
+                "data": "2022W527",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/date.json b/tests/draft2019-09/optional/format/date.json
index 64dbefb2..70d35337 100644
--- a/tests/draft2019-09/optional/format/date.json
+++ b/tests/draft2019-09/optional/format/date.json
@@ -220,6 +220,26 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4)",
                 "data": "1963-06-1৪",
                 "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: YYYYMMDD without dashes (2023-03-28)",
+                "data": "20230328",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number implicit day of week (2023-01-02)",
+                "data": "2023-W01",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number with day of week (2023-03-28)",
+                "data": "2023-W13-2",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number + day of week + rollover to next year (2023-01-01)",
+                "data": "2022W527",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/date.json b/tests/draft2020-12/optional/format/date.json
index 7b893291..fa695ccb 100644
--- a/tests/draft2020-12/optional/format/date.json
+++ b/tests/draft2020-12/optional/format/date.json
@@ -220,6 +220,26 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4)",
                 "data": "1963-06-1৪",
                 "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: YYYYMMDD without dashes (2023-03-28)",
+                "data": "20230328",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number implicit day of week (2023-01-02)",
+                "data": "2023-W01",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number with day of week (2023-03-28)",
+                "data": "2023-W13-2",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number + day of week + rollover to next year (2023-01-01)",
+                "data": "2022W527",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/date.json b/tests/draft7/optional/format/date.json
index 06c9ea0f..7232e1a6 100644
--- a/tests/draft7/optional/format/date.json
+++ b/tests/draft7/optional/format/date.json
@@ -217,6 +217,26 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4)",
                 "data": "1963-06-1৪",
                 "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: YYYYMMDD without dashes (2023-03-28)",
+                "data": "20230328",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number implicit day of week (2023-01-02)",
+                "data": "2023-W01",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number with day of week (2023-03-28)",
+                "data": "2023-W13-2",
+                "valid": false
+            },
+            {
+                "description": "ISO8601 / non-RFC3339: week number + day of week + rollover to next year (2023-01-01)",
+                "data": "2022W527",
+                "valid": false
             }
         ]
     }