From 23c0c9ca56d2f6508c1a74626a338a7d16678ee6 Mon Sep 17 00:00:00 2001
From: Dmytro Shteflyuk <kpumuk@kpumuk.info>
Date: Tue, 4 Nov 2025 16:16:09 -0500
Subject: [PATCH] Added a release date format check to the linter

---
 _data/releases.yml                       |  6 +++---
 lib/linter.rb                            |  1 +
 test/test_linter_invalid_release_data.rb | 11 +++++++++++
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/_data/releases.yml b/_data/releases.yml
index 3407132d34..3e8e8ac2c6 100644
--- a/_data/releases.yml
+++ b/_data/releases.yml
@@ -339,7 +339,7 @@
 # 3.3 series
 
 - version: 3.3.10
-  date: '2025-10-23'
+  date: 2025-10-23
   post: "/en/news/2025/10/23/ruby-3-3-10-released/"
   url:
     gz: https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.10.tar.gz
@@ -363,7 +363,7 @@
     zip: 70ee931fe6ceca0f105e270c882fc019299450fbe75b3da4cadc14a544270eda876eb8cba47a164cac2ada3116b70e6c24efa7061ceab62c1d4af20a16caaf35
 
 - version: 3.3.9
-  date: '2025-07-24'
+  date: 2025-07-24
   post: "/en/news/2025/07/24/ruby-3-3-9-released/"
   url:
     gz: https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.9.tar.gz
@@ -727,7 +727,7 @@
 # 3.2 series
 
 - version: 3.2.9
-  date: '2025-07-24'
+  date: 2025-07-24
   post: "/en/news/2025/07/24/ruby-3-2-9-released/"
   url:
     gz: https://cache.ruby-lang.org/pub/ruby/3.2/ruby-3.2.9.tar.gz
diff --git a/lib/linter.rb b/lib/linter.rb
index f3254ffdfc..63d9e807bf 100644
--- a/lib/linter.rb
+++ b/lib/linter.rb
@@ -125,6 +125,7 @@ def check_releases
       errors[release] << invalid_url_message(release.post)  if release.post_url_invalid?
       errors[release] << "release date and post date do not match"  if release.date_mismatch?
       errors[release] << missing_post_message(release.post_filename)  if release.post_missing?
+      errors[release] << "release date is a string, not a Date object"  if release.date.is_a?(String)
     end
   end
 
diff --git a/test/test_linter_invalid_release_data.rb b/test/test_linter_invalid_release_data.rb
index 24efe49272..b57176760f 100644
--- a/test/test_linter_invalid_release_data.rb
+++ b/test/test_linter_invalid_release_data.rb
@@ -57,4 +57,15 @@
     create_file("_data/releases.yml", content)
     _(linter_output).must_match "release date and post date do not match"
   end
+
+  it "reports release data with wrong date format" do
+    content = <<~YAML
+      - version: 2.7.1
+        date: '2020-01-01'
+        post: /en/news/2020/01/01/post/
+    YAML
+
+    create_file("_data/releases.yml", content)
+    _(linter_output).must_match "release date is a string, not a Date object"
+  end
 end