From b4a3709899a7f1ec3a9f871652b3985ac760b19b Mon Sep 17 00:00:00 2001
From: Tushar Verma <tusharmyself06@gmail.com>
Date: Tue, 24 Mar 2026 18:26:25 +0530
Subject: [PATCH 1/5] test(draft2020-12): add leap year boundary tests for date
 format

---
 tests/draft2020-12/optional/format/date.json | 48 ++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tests/draft2020-12/optional/format/date.json b/tests/draft2020-12/optional/format/date.json
index 01731c34..b18b135f 100644
--- a/tests/draft2020-12/optional/format/date.json
+++ b/tests/draft2020-12/optional/format/date.json
@@ -245,6 +245,54 @@
                 "description": "an invalid time string in date-time format",
                 "data": "2020-11-28T23:55:45Z",
                 "valid": false
+            },
+            {
+                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
+                "data": "0000-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
+                "data": "0100-02-29",
+                "valid": false
+            },
+            {
+                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
+                "data": "0400-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
+                "data": "2100-02-29",
+                "valid": false
+            },
+            {
+                "description": "invalid: leading whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": " 2024-01-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: trailing whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": "2024-01-15 ",
+                "valid": false
+            },
+            {
+                "description": "invalid: month 00 is not valid per date-month range 01-12",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-month = 2DIGIT ; 01-12",
+                "data": "2024-00-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: day 00 is not valid per date-mday minimum of 01",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-mday = 2DIGIT ; 01-28/29/30/31",
+                "data": "2024-01-00",
+                "valid": false
             }
         ]
     }

From ac5d35a442cf87a69f5e3363605d8342abc4933b Mon Sep 17 00:00:00 2001
From: Tushar Verma <tusharmyself06@gmail.com>
Date: Tue, 24 Mar 2026 18:26:45 +0530
Subject: [PATCH 2/5] test(draft2019-09): add leap year boundary tests for date
 format

---
 tests/draft2019-09/optional/format/date.json | 48 ++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tests/draft2019-09/optional/format/date.json b/tests/draft2019-09/optional/format/date.json
index 1ba5d9ca..06f13b7a 100644
--- a/tests/draft2019-09/optional/format/date.json
+++ b/tests/draft2019-09/optional/format/date.json
@@ -245,6 +245,54 @@
                 "description": "an invalid time string in date-time format",
                 "data": "2020-11-28T23:55:45Z",
                 "valid": false
+            },
+            {
+                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
+                "data": "0000-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
+                "data": "0100-02-29",
+                "valid": false
+            },
+            {
+                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
+                "data": "0400-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
+                "data": "2100-02-29",
+                "valid": false
+            },
+            {
+                "description": "invalid: leading whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": " 2024-01-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: trailing whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": "2024-01-15 ",
+                "valid": false
+            },
+            {
+                "description": "invalid: month 00 is not valid per date-month range 01-12",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-month = 2DIGIT ; 01-12",
+                "data": "2024-00-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: day 00 is not valid per date-mday minimum of 01",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-mday = 2DIGIT ; 01-28/29/30/31",
+                "data": "2024-01-00",
+                "valid": false
             }
         ]
     }

From a2b70d89c8c32c5b7a2b97154d5ff78b940a63f7 Mon Sep 17 00:00:00 2001
From: Tushar Verma <tusharmyself06@gmail.com>
Date: Tue, 24 Mar 2026 18:27:03 +0530
Subject: [PATCH 3/5] test(draft7): add leap year boundary tests for year 0000
 and century years

---
 tests/draft7/optional/format/date.json | 48 ++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tests/draft7/optional/format/date.json b/tests/draft7/optional/format/date.json
index 2cfdcf3f..f22a0c76 100644
--- a/tests/draft7/optional/format/date.json
+++ b/tests/draft7/optional/format/date.json
@@ -242,6 +242,54 @@
                 "description": "an invalid time string in date-time format",
                 "data": "2020-11-28T23:55:45Z",
                 "valid": false
+            },
+            {
+                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
+                "data": "0000-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
+                "data": "0100-02-29",
+                "valid": false
+            },
+            {
+                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
+                "data": "0400-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
+                "data": "2100-02-29",
+                "valid": false
+            },
+            {
+                "description": "invalid: leading whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": " 2024-01-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: trailing whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": "2024-01-15 ",
+                "valid": false
+            },
+            {
+                "description": "invalid: month 00 is not valid per date-month range 01-12",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-month = 2DIGIT ; 01-12",
+                "data": "2024-00-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: day 00 is not valid per date-mday minimum of 01",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-mday = 2DIGIT ; 01-28/29/30/31",
+                "data": "2024-01-00",
+                "valid": false
             }
         ]
     }

From 93d9dcdea00f68299aa36984a675b537752ed2f0 Mon Sep 17 00:00:00 2001
From: Tushar Verma <tusharmyself06@gmail.com>
Date: Tue, 24 Mar 2026 18:27:18 +0530
Subject: [PATCH 4/5] test(date): add leap year boundary tests for year 0000
 and century years

---
 tests/v1/format/date.json | 48 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tests/v1/format/date.json b/tests/v1/format/date.json
index f120d37e..fe53028d 100644
--- a/tests/v1/format/date.json
+++ b/tests/v1/format/date.json
@@ -245,6 +245,54 @@
                 "description": "an invalid time string in date-time format",
                 "data": "2020-11-28T23:55:45Z",
                 "valid": false
+            },
+            {
+                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
+                "data": "0000-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
+                "data": "0100-02-29",
+                "valid": false
+            },
+            {
+                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
+                "data": "0400-02-29",
+                "valid": true
+            },
+            {
+                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
+                "data": "2100-02-29",
+                "valid": false
+            },
+            {
+                "description": "invalid: leading whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": " 2024-01-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: trailing whitespace is not permitted",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — full-date grammar does not include whitespace",
+                "data": "2024-01-15 ",
+                "valid": false
+            },
+            {
+                "description": "invalid: month 00 is not valid per date-month range 01-12",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-month = 2DIGIT ; 01-12",
+                "data": "2024-00-15",
+                "valid": false
+            },
+            {
+                "description": "invalid: day 00 is not valid per date-mday minimum of 01",
+                "comment": "https://www.rfc-editor.org/rfc/rfc3339#section-5.6 — date-mday = 2DIGIT ; 01-28/29/30/31",
+                "data": "2024-01-00",
+                "valid": false
             }
         ]
     }

From b5253b2729eb7adf60c5357d602b81dedbc834b5 Mon Sep 17 00:00:00 2001
From: Tushar Verma <tusharmyself06@gmail.com>
Date: Tue, 24 Mar 2026 18:40:18 +0530
Subject: [PATCH 5/5] fix: shorten test descriptions to meet <70 char limit

---
 tests/draft2019-09/optional/format/date.json | 8 ++++----
 tests/draft2020-12/optional/format/date.json | 8 ++++----
 tests/draft7/optional/format/date.json       | 8 ++++----
 tests/v1/format/date.json                    | 8 ++++----
 4 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/tests/draft2019-09/optional/format/date.json b/tests/draft2019-09/optional/format/date.json
index 06f13b7a..652238c3 100644
--- a/tests/draft2019-09/optional/format/date.json
+++ b/tests/draft2019-09/optional/format/date.json
@@ -247,25 +247,25 @@
                 "valid": false
             },
             {
-                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "description": "year 0000 is a leap year (0 % 400 == 0)",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
                 "data": "0000-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "description": "century year 0100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
                 "data": "0100-02-29",
                 "valid": false
             },
             {
-                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "description": "century year 0400 is a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
                 "data": "0400-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "description": "century year 2100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
                 "data": "2100-02-29",
                 "valid": false
diff --git a/tests/draft2020-12/optional/format/date.json b/tests/draft2020-12/optional/format/date.json
index b18b135f..7e5df1ac 100644
--- a/tests/draft2020-12/optional/format/date.json
+++ b/tests/draft2020-12/optional/format/date.json
@@ -247,25 +247,25 @@
                 "valid": false
             },
             {
-                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "description": "year 0000 is a leap year (0 % 400 == 0)",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
                 "data": "0000-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "description": "century year 0100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
                 "data": "0100-02-29",
                 "valid": false
             },
             {
-                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "description": "century year 0400 is a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
                 "data": "0400-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "description": "century year 2100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
                 "data": "2100-02-29",
                 "valid": false
diff --git a/tests/draft7/optional/format/date.json b/tests/draft7/optional/format/date.json
index f22a0c76..05d9a035 100644
--- a/tests/draft7/optional/format/date.json
+++ b/tests/draft7/optional/format/date.json
@@ -244,25 +244,25 @@
                 "valid": false
             },
             {
-                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "description": "year 0000 is a leap year (0 % 400 == 0)",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
                 "data": "0000-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "description": "century year 0100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
                 "data": "0100-02-29",
                 "valid": false
             },
             {
-                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "description": "century year 0400 is a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
                 "data": "0400-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "description": "century year 2100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
                 "data": "2100-02-29",
                 "valid": false
diff --git a/tests/v1/format/date.json b/tests/v1/format/date.json
index fe53028d..0285b4e4 100644
--- a/tests/v1/format/date.json
+++ b/tests/v1/format/date.json
@@ -247,25 +247,25 @@
                 "valid": false
             },
             {
-                "description": "valid: year 0000 is a leap year per RFC 3339 Appendix C (0 % 400 == 0)",
+                "description": "year 0000 is a leap year (0 % 400 == 0)",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — year zero leap year edge case",
                 "data": "0000-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 0100 is not divisible by 400, so not a leap year",
+                "description": "century year 0100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 100 % 100 == 0 but 100 % 400 != 0",
                 "data": "0100-02-29",
                 "valid": false
             },
             {
-                "description": "valid: century year 0400 is divisible by 400, so it is a leap year",
+                "description": "century year 0400 is a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — 400-year cycle boundary",
                 "data": "0400-02-29",
                 "valid": true
             },
             {
-                "description": "invalid: century year 2100 is not divisible by 400, so not a leap year",
+                "description": "century year 2100 is not a leap year",
                 "comment": "https://www.rfc-editor.org/rfc/rfc3339#appendix-C — future century year",
                 "data": "2100-02-29",
                 "valid": false