Add CI predefined environment variable CI_COMMIT_TIMESTAMP

app/models/ci/pipeline.rb

@@ -491,6 +491,12 @@ module Ci
       end
     end
 
+    def git_commit_timestamp
+      strong_memoize(:git_commit_timestamp) do
+        commit.try(:timestamp)
+      end
+    end
+
     def before_sha
       super || Gitlab::Git::BLANK_SHA
     end
@@ -768,6 +774,7 @@ module Ci
         variables.append(key: 'CI_COMMIT_TITLE', value: git_commit_full_title.to_s)
         variables.append(key: 'CI_COMMIT_DESCRIPTION', value: git_commit_description.to_s)
         variables.append(key: 'CI_COMMIT_REF_PROTECTED', value: (!!protected_ref?).to_s)
+        variables.append(key: 'CI_COMMIT_TIMESTAMP', value: git_commit_timestamp.to_s)
 
         # legacy variables
         variables.append(key: 'CI_BUILD_REF', value: sha)

app/models/commit.rb

@@ -221,12 +221,16 @@ class Commit
     description.present?
   end
 
+  def timestamp
+    committed_date.xmlschema
+  end
+
   def hook_attrs(with_changed_files: false)
     data = {
       id: id,
       message: safe_message,
       title: title,
-      timestamp: committed_date.xmlschema,
+      timestamp: timestamp,
       url: Gitlab::UrlBuilder.build(self),
       author: {
         name: author_name,

changelogs/unreleased/34281-add-ci-variable-commit-timestamp.yml

+---
+title: Add CI_COMMIT_TIMESTAMP CI variable
+merge_request: 40388
+author: Nasko Vasilev
+type: added

doc/ci/variables/predefined_variables.md

@@ -43,6 +43,7 @@ Kubernetes-specific environment variables are detailed in the
 | `CI_COMMIT_BRANCH`                            | 12.6   | 0.5    | The commit branch name. Present only when building branches.                                                                                                                                                                                                                                                                                                      |
 | `CI_COMMIT_TAG`                               | 9.0    | 0.5    | The commit tag name. Present only when building tags.                                                                                                                                                                                                                                                                                                      |
 | `CI_COMMIT_TITLE`                             | 10.8   | all    | The title of the commit - the full first line of the message                                                                                                                                                                                                                                                                                               |
+| `CI_COMMIT_TIMESTAMP`                         | 13.4   | all    | The timestamp of the commit in the ISO 8601 format.                                                                                                                                                                                                                                                                                               |
 | `CI_CONCURRENT_ID`                            | all    | 11.10  | Unique ID of build execution within a single executor.                                                                                                                                                                                                                                                                                                     |
 | `CI_CONCURRENT_PROJECT_ID`                    | all    | 11.10  | Unique ID of build execution within a single executor and project.                                                                                                                                                                                                                                                                                         |
 | `CI_CONFIG_PATH`                              | 9.4    | 0.5    | The path to CI configuration file. Defaults to `.gitlab-ci.yml`                                                                                                                                                                                                                                                                                                   |

spec/models/ci/bridge_spec.rb

@@ -50,6 +50,7 @@ RSpec.describe Ci::Bridge do
         CI_PROJECT_PATH_SLUG CI_PROJECT_NAMESPACE CI_PROJECT_ROOT_NAMESPACE
         CI_PIPELINE_IID CI_CONFIG_PATH CI_PIPELINE_SOURCE CI_COMMIT_MESSAGE
         CI_COMMIT_TITLE CI_COMMIT_DESCRIPTION CI_COMMIT_REF_PROTECTED
+        CI_COMMIT_TIMESTAMP
       ]
 
       expect(bridge.scoped_variables_hash.keys).to include(*variables)

spec/models/ci/build_spec.rb

@@ -2329,6 +2329,7 @@ RSpec.describe Ci::Build do
           { key: 'CI_COMMIT_TITLE', value: pipeline.git_commit_title, public: true, masked: false },
           { key: 'CI_COMMIT_DESCRIPTION', value: pipeline.git_commit_description, public: true, masked: false },
           { key: 'CI_COMMIT_REF_PROTECTED', value: (!!pipeline.protected_ref?).to_s, public: true, masked: false },
+          { key: 'CI_COMMIT_TIMESTAMP', value: pipeline.git_commit_timestamp, public: true, masked: false },
           { key: 'CI_BUILD_REF', value: build.sha, public: true, masked: false },
           { key: 'CI_BUILD_BEFORE_SHA', value: build.before_sha, public: true, masked: false },
           { key: 'CI_BUILD_REF_NAME', value: build.ref, public: true, masked: false },

spec/models/ci/pipeline_spec.rb

@@ -715,6 +715,7 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
         CI_COMMIT_TITLE
         CI_COMMIT_DESCRIPTION
         CI_COMMIT_REF_PROTECTED
+        CI_COMMIT_TIMESTAMP
         CI_BUILD_REF
         CI_BUILD_BEFORE_SHA
         CI_BUILD_REF_NAME