diff --git a/tests/draft-next/optional/format/date-time.json b/tests/draft-next/optional/format/date-time.json
index e25845b0..c41ceda0 100644
--- a/tests/draft-next/optional/format/date-time.json
+++ b/tests/draft-next/optional/format/date-time.json
@@ -130,6 +130,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2019-09/optional/format/date-time.json b/tests/draft2019-09/optional/format/date-time.json
index 731001d5..ae837299 100644
--- a/tests/draft2019-09/optional/format/date-time.json
+++ b/tests/draft2019-09/optional/format/date-time.json
@@ -130,6 +130,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft2020-12/optional/format/date-time.json b/tests/draft2020-12/optional/format/date-time.json
index 8783d732..c764a173 100644
--- a/tests/draft2020-12/optional/format/date-time.json
+++ b/tests/draft2020-12/optional/format/date-time.json
@@ -130,6 +130,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft3/optional/format/date-time.json b/tests/draft3/optional/format/date-time.json
index 1f1e6fb3..89e6b72f 100644
--- a/tests/draft3/optional/format/date-time.json
+++ b/tests/draft3/optional/format/date-time.json
@@ -32,6 +32,11 @@
                 "description": "invalid non-padded day dates",
                 "data": "1963-06-1T08:30:06.283185Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft4/optional/format/date-time.json b/tests/draft4/optional/format/date-time.json
index 09112737..810ac20b 100644
--- a/tests/draft4/optional/format/date-time.json
+++ b/tests/draft4/optional/format/date-time.json
@@ -127,6 +127,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft6/optional/format/date-time.json b/tests/draft6/optional/format/date-time.json
index 09112737..810ac20b 100644
--- a/tests/draft6/optional/format/date-time.json
+++ b/tests/draft6/optional/format/date-time.json
@@ -127,6 +127,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }
diff --git a/tests/draft7/optional/format/date-time.json b/tests/draft7/optional/format/date-time.json
index 09112737..810ac20b 100644
--- a/tests/draft7/optional/format/date-time.json
+++ b/tests/draft7/optional/format/date-time.json
@@ -127,6 +127,11 @@
                 "description": "invalid non-ASCII '৪' (a Bengali 4) in time portion",
                 "data": "1963-06-11T0৪:00:00Z",
                 "valid": false
+            },
+            {
+                "description": "invalid extended year",
+                "data": "+11963-06-19T08:30:06.283185Z",
+                "valid": false
             }
         ]
     }