diff --git a/pkgs/repo_manage/lib/changelog_updater.dart b/pkgs/repo_manage/lib/changelog_updater.dart
new file mode 100644
index 00000000..f8176e9c
--- /dev/null
+++ b/pkgs/repo_manage/lib/changelog_updater.dart
@@ -0,0 +1,93 @@
+// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'src/common.dart';
+
+String updateChangelogContent(String changelog, String message) {
+  final lines = LineSplitter.split(changelog).toList();
+  var currentVersion = '0.0.1';
+  var currentVersionLine = 0;
+
+  for (var i = 0; i < lines.length; i++) {
+    final line = lines[i].trim();
+    if (line.startsWith('## ')) {
+      final content = line.substring(3).trim();
+      final version = content.split(' ').first;
+      if (version.startsWith(RegExp(r'\d'))) {
+        currentVersion = version;
+        currentVersionLine = i;
+        break;
+      }
+    }
+  }
+
+  final isWip = currentVersion.endsWith('-wip');
+
+  final output = <String>[];
+  if (isWip) {
+    var sectionEnd = lines.indexWhere(
+            (line) => line.startsWith('## '), currentVersionLine + 1) -
+        1;
+    if (sectionEnd < 0) {
+      sectionEnd = lines.length;
+    }
+
+    output.addAll(lines.take(sectionEnd));
+    output.add('- $message');
+    output.addAll(lines.skip(sectionEnd));
+  } else {
+    output.addAll([
+      '## $currentVersion-wip',
+      '',
+      '- $message',
+      '',
+      ...lines,
+    ]);
+  }
+
+  return '${output.join('\n')}\n';
+}
+
+class ChangelogUpdaterCommand extends ReportCommand {
+  ChangelogUpdaterCommand()
+      : super('changelog', 'Update a changelog with a new entry.') {
+    argParser.addOption(
+      'changelog',
+      abbr: 'c',
+      help: 'Path to the changelog file to update. Defaults to CHANGELOG.md.',
+    );
+  }
+
+  @override
+  Future<int> run() async {
+    final args = argResults?.rest ?? const <String>[];
+    if (args.isEmpty) {
+      stderr.writeln('''
+Usage: dart run report.dart changelog [--changelog <path>] "Your changelog message"''');
+      stderr
+          .writeln('If no --changelog path is provided, CHANGELOG.md is used.');
+      return 1;
+    }
+
+    final message = args.join(' ');
+    final changelogFile =
+        File(argResults?['changelog'] as String? ?? 'CHANGELOG.md');
+
+    if (!changelogFile.existsSync()) {
+      stderr.writeln('Error: ${changelogFile.path} not found.');
+      return 1;
+    }
+
+    final newChangelog = updateChangelogContent(
+      changelogFile.readAsStringSync(),
+      message,
+    );
+    changelogFile.writeAsStringSync(newChangelog);
+    stdout.writeln('Changelog updated successfully.');
+    return 0;
+  }
+}
diff --git a/pkgs/repo_manage/lib/src/common.dart b/pkgs/repo_manage/lib/src/common.dart
index 87bc5122..f8245e9b 100644
--- a/pkgs/repo_manage/lib/src/common.dart
+++ b/pkgs/repo_manage/lib/src/common.dart
@@ -10,6 +10,7 @@ import 'package:github/github.dart';
 import 'package:graphql/client.dart';
 
 import '../branches.dart';
+import '../changelog_updater.dart';
 import '../contributors.dart';
 import '../issue_transfer.dart';
 import '../labels.dart';
@@ -80,6 +81,7 @@ class ReportCommandRunner extends CommandRunner<int> {
       : super('report',
             'Run various reports on Dart and Flutter related repositories.') {
     addCommand(BranchesCommand());
+    addCommand(ChangelogUpdaterCommand());
     addCommand(ContributorsCommand());
     addCommand(LabelsCommand());
     addCommand(LabelsUpdateCommand());
diff --git a/pkgs/repo_manage/pubspec.yaml b/pkgs/repo_manage/pubspec.yaml
index c1945d02..9129dd10 100644
--- a/pkgs/repo_manage/pubspec.yaml
+++ b/pkgs/repo_manage/pubspec.yaml
@@ -3,6 +3,10 @@ description: Miscellaneous issue, repo, and PR query tools.
 
 publish_to: none
 
+executables:
+  report:
+
+
 environment:
   sdk: ^3.3.0
 
@@ -15,3 +19,4 @@ dependencies:
 
 dev_dependencies:
   dart_flutter_team_lints: ^3.0.0
+  test: ^1.25.0
diff --git a/pkgs/repo_manage/test/changelog_updater_test.dart b/pkgs/repo_manage/test/changelog_updater_test.dart
new file mode 100644
index 00000000..052f6d5e
--- /dev/null
+++ b/pkgs/repo_manage/test/changelog_updater_test.dart
@@ -0,0 +1,66 @@
+import 'dart:io';
+
+import 'package:repo_manage/changelog_updater.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('updateChangelogContent', () {
+    test('adds an entry to a wip changelog', () {
+      expectGolden(
+        inputPath: 'test/data/changelog_wip.md',
+        goldenPath: 'test/data/golden/changelog_wip.golden',
+        message: 'Add new feature',
+      );
+    });
+
+    test('creates a new wip section from a released changelog', () {
+      expectGolden(
+        inputPath: 'test/data/changelog_release.md',
+        goldenPath: 'test/data/golden/changelog_release.golden',
+        message: 'Fix regression',
+      );
+    });
+
+    test('creates a starter changelog when none is present', () {
+      expectGolden(
+        inputPath: 'test/data/changelog_empty.md',
+        goldenPath: 'test/data/golden/changelog_empty.golden',
+        message: 'Initial entry',
+      );
+    });
+
+    test('handles complex timezone formatting', () {
+      expectGolden(
+        inputPath: 'test/data/changelog_complex_timezone.md',
+        goldenPath: 'test/data/golden/changelog_complex_timezone.golden',
+        message: 'Add new feature',
+      );
+    });
+
+    test('handles complex timezone formatting with WIP suffix', () {
+      expectGolden(
+        inputPath: 'test/data/changelog_complex_timezone_wip.md',
+        goldenPath: 'test/data/golden/changelog_complex_timezone_wip.golden',
+        message: 'Add new feature',
+      );
+    });
+  });
+}
+
+void expectGolden({
+  required String inputPath,
+  required String goldenPath,
+  required String message,
+}) {
+  final input = File(inputPath).readAsStringSync();
+  final output = updateChangelogContent(input, message);
+  final goldenFile = File(goldenPath);
+
+  if (!goldenFile.existsSync()) {
+    goldenFile.parent.createSync(recursive: true);
+    goldenFile.writeAsStringSync(output);
+    return;
+  }
+
+  expect(output, goldenFile.readAsStringSync());
+}
diff --git a/pkgs/repo_manage/test/data/changelog_complex_timezone.md b/pkgs/repo_manage/test/data/changelog_complex_timezone.md
new file mode 100644
index 00000000..259e8c5d
--- /dev/null
+++ b/pkgs/repo_manage/test/data/changelog_complex_timezone.md
@@ -0,0 +1,297 @@
+## 0.11.1
+
+- Specify `Etc/UTC` as the default timezone (replaces `UTC`)
+
+## 0.11.0
+
+- Make `Location.offset` a `Duration` instead of an `int`.
+- Generate list of common locations fom IANA data.
+- Move to `dart-lang/labs` monorepo.
+- Add timezone data version to generated headers.
+
+# 0.10.2
+
+- Upgrade minimum SDK to `^3.10.0` and the databases to [2025c].
+
+[2025c]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/TAGXKYLMAQRZRFTERQ33CEKOW7KRJVAK/
+
+# 0.10.1
+
+- Time zone database updated to 2025b. For your convenience here is the
+  announcement for [2025a], [2025b].
+- Added a `native` getter for `TZDateTime`. Thanks @klondikedragon!
+
+[2025a]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/MWII7R3HMCEDNUCIYQKSSTYYR7UWK4OQ/
+[2025b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/6JVHNHLB6I2WAYTQ75L6KEPEQHFXAJK3/
+
+# 0.10.0
+
+- Update time zone-updating script to use `rearguard.zi`.
+- Convert `browser.dart` to use `package:http` instead of `dart:html` for HTTP
+  requests.
+- Time zone database updated to 2024b. For your convenience here is the
+  announcement for [2024b].
+
+[2024b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/IZ7AO6WRE3W3TWBL5IR6PMQUL433BQIE/
+
+# 0.9.4
+
+- Support cross-isolate issues by overriding `hashCode` and `operator ==` on
+  class `Location`. (see #147)
+- Fix incorrect DST transition. (see #166)
+
+# 0.9.3
+
+- Time zone database updated to 2024a. For your convenience here are the
+  announcements for [2023d], [2024a].
+
+[2023d]: https://mm.icann.org/pipermail/tz-announce/2023-December.txt
+[2024a]: https://mm.icann.org/pipermail/tz-announce/2024-February.txt
+
+
+# 0.9.2
+
+- Time zone database updated to 2023c. For your convenience here are the
+  announcements for [2023a], [2023b], [2023c].
+
+[2023a]: https://mm.icann.org/pipermail/tz-announce/2023-March/000077.html
+[2023b]: https://mm.icann.org/pipermail/tz-announce/2023-March/000078.html
+[2023c]: https://mm.icann.org/pipermail/tz-announce/2023-March/000079.html
+
+# 0.9.1
+
+- Time zone database updated to 2022g. For your convenience here are the
+  announcements for [2022d], [2022e], [2022f], [2022g].
+
+[2022d]: https://mm.icann.org/pipermail/tz-announce/2022-September/000073.html
+[2022e]: https://mm.icann.org/pipermail/tz-announce/2022-October/000074.html
+[2022f]: https://mm.icann.org/pipermail/tz-announce/2022-October/000075.html
+[2022g]: https://mm.icann.org/pipermail/tz-announce/2022-November/000076.html
+
+# 0.9.0
+
+- Time zone database updated to 2022c. For your convenience here are the
+  announcements for [2022a], [2022b], [2022c].
+- Removed named database files in `lib/data` (for example, `lib/data/2021e.tzf`).
+  The only supported database files are all now named `latest_*`.
+
+[2022a]: https://mm.icann.org/pipermail/tz-announce/2022-March/000070.html
+[2022b]: https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html
+[2022c]: https://mm.icann.org/pipermail/tz-announce/2022-August/000072.html
+
+# 0.8.1
+
+- Time zone database updated to 2021e. For your convenience here are the
+  announcements for [2021b], [2021c], [2021d], [2021e].
+- Fixed encoding script to not skip a few missing time zones.
+
+[2021b]: https://mm.icann.org/pipermail/tz-announce/2021-September/000066.html
+[2021c]: https://mm.icann.org/pipermail/tz-announce/2021-October/000067.html
+[2021d]: https://mm.icann.org/pipermail/tz-announce/2021-October/000068.html
+[2021e]: https://mm.icann.org/pipermail/tz-announce/2021-October/000069.html
+
+# 0.8.0
+
+- Time zone database updated to 2021a. For your convenience here is the
+  announcement for [2021a].
+- Time zone databases encoded with UTF-16 instead of base64.
+- **Breaking change**: Remove `tool/encode.dart` in favor of
+  `tool/encode_dart.dart`.
+
+[2021a]: https://mm.icann.org/pipermail/tz-announce/2021-January/000065.html
+
+
+# 0.7.0
+
+- **Breaking change**: Change some of TimeZone's constructor parameters to be
+  named instead of positional.
+- **Breaking change**: Rename `TimeZone.abbr` to `TimeZone.abbreviation`.
+- Deprecate `LocationDatabase.isEmpty` in favor of
+  `LocationDatabase.isInitialized`.
+- Removed `new` usage from examples and fixed a typo in the `TZDateTime.from`
+  example.
+- Migrate to Dart's null safety language feature.
+
+# 0.6.1
+
+- Updated the `get` script (now `encode_tzf`) to work with a `zoneinfo`
+  directory (as created by the `zic` tool) as input. Fetching and compiling this
+  directory is now done by a bash script (`refresh.sh`) using standard tools.
+
+  This allows pointing the tool at a custom `zoneinfo` directory.
+
+# 0.6.0
+
+- Stopping internal versioning of time zone data. Only the latest data will be
+  included, as there is no use case for using an outdated version.
+- Renaming the `_2015_2025` database to `_10y` for it to have a stable name.
+  In the past `latest_2010-2020.tzf` had to be renamed to
+  `latest_2015-2025.tzf`.
+
+# 0.5.9
+
+- Time zone database updated to 2020d. For your convenience here is the
+  announcement for [2020d].
+
+[2020d]: https://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
+
+# 0.5.8
+
+- Time zone database updated to 2020b. For your convenience here is the
+  announcement for [2020b].
+
+[2020b]: https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
+
+# 0.5.7
+
+- Time zone database updated to 2020a. For your convenience here is the
+  announcement for [2020a].
+- Earlier null checking on some TZDateTime constructor arguments.
+- Many internal changes; should not affect API.
+
+[2020a]: https://mm.icann.org/pipermail/tz-announce/2020-April/000058.html
+
+# 0.5.6
+
+- Time zone database updated to 2019c. For your convenience here is the
+  announcement for [2019c].
+- Dart-importable databases made available in `lib/data`. README.md has more
+  details.
+
+[2019c]: https://mm.icann.org/pipermail/tz-announce/2019-September/000057.html
+
+# 0.5.5
+
+- Time zone database updated to 2019b. For your convenience here is the
+  announcement for [2019b].
+- Convenience database symlinks added for convenience at
+  - `lib/data/latest.tzf`
+  - `lib/data/latest_2015-2025.tzf`
+  - `lib/data/latest_all.tzf`
+
+[2019b]: https://mm.icann.org/pipermail/tz-announce/2019-July/000056.html
+
+# 0.5.4
+
+- TZDateTime.utc is accessible before time zone database is initialized (thanks
+  @jsmarr).
+- Fix dropping microseconds when creating TZDateTime (thanks @jsmarr).
+
+# 0.5.3
+
+- Time zone database updated to 2019a. For your convenience here is the
+  announcement for [2019a].
+
+[2019a]: https://mm.icann.org/pipermail/tz-announce/2019-March/000055.html
+
+# 0.5.2
+
+- Time zone database updated to 2018i. For your convenience here are the
+  announcements for [2018h] and [2018i].
+
+[2018h]: https://mm.icann.org/pipermail/tz-announce/2018-December/000053.html
+[2018i]: https://mm.icann.org/pipermail/tz-announce/2018-December/000054.html
+
+# 0.5.1
+
+- Time zone database updated to 2018g. For your convenience here are the
+  announcements for [2018d], [2018e], [2018f], and [2018g].
+
+[2018d]: https://mm.icann.org/pipermail/tz-announce/2018-March/000049.html
+[2018e]: https://mm.icann.org/pipermail/tz-announce/2018-May/000050.html
+[2018f]: https://mm.icann.org/pipermail/tz-announce/2018-October/000051.html
+[2018g]: https://mm.icann.org/pipermail/tz-announce/2018-October/000052.html
+
+# 0.5.0
+
+- Support a package-directory-free environment. In Dart 1.19, timezone is now
+  compatible with `pub get --no-packages-dir`.
+- **Breaking:** Remove initializeTimeZoneSync method; it is incompatible with
+  the async method for resolving package URIs.
+- Fix all strong mode _errors_ (thanks @har79).
+- Add microsecond support (thanks @har79).
+- Improve interaction between TZDateTime and native DateTime (thanks @har79).
+- Fix TimeZone's `==` (thanks @har79).
+- Many new dartdoc comments (thanks @har79).
+- Fix for calling `new TZDateTime.from()` with a non-UTC DateTime object
+  (thanks @tomaine2002).
+- Support Dart 2.
+- Time zone database updated to 2018c. For your convenience here are the
+  announcements for [2015c], [2015d], [2015e], [2015f], [2015g], [2016a],
+  [2016b], [2016c], [2016d], [2016e], [2016f], [2016g], [2016h], [2016i],
+  [2017a], [2017b], [2017c], and [2018c].
+
+[2015c]: https://mm.icann.org/pipermail/tz-announce/2015-April/000030.html
+[2015d]: https://mm.icann.org/pipermail/tz-announce/2015-April/000031.html
+[2015e]: https://mm.icann.org/pipermail/tz-announce/2015-June/000032.html
+[2015f]: https://mm.icann.org/pipermail/tz-announce/2015-August/000033.html
+[2015g]: https://mm.icann.org/pipermail/tz-announce/2015-October/000034.html
+[2016a]: https://mm.icann.org/pipermail/tz-announce/2016-January/000035.html
+[2016b]: https://mm.icann.org/pipermail/tz-announce/2016-March/000036.html
+[2016c]: https://mm.icann.org/pipermail/tz-announce/2016-March/000037.html
+[2016d]: https://mm.icann.org/pipermail/tz-announce/2016-April/000038.html
+[2016e]: https://mm.icann.org/pipermail/tz-announce/2016-June/000039.html
+[2016f]: https://mm.icann.org/pipermail/tz-announce/2016-July/000040.html
+[2016g]: https://mm.icann.org/pipermail/tz-announce/2016-September/000041.html
+[2016h]: https://mm.icann.org/pipermail/tz-announce/2016-October/000042.html
+[2016i]: https://mm.icann.org/pipermail/tz-announce/2016-November/000043.html
+[2017a]: https://mm.icann.org/pipermail/tz-announce/2017-February/000045.html
+[2017b]: https://mm.icann.org/pipermail/tz-announce/2017-March/000046.html
+[2017c]: https://mm.icann.org/pipermail/tz-announce/2017-October/000047.html
+[2018c]: https://mm.icann.org/pipermail/tz-announce/2018-January/000048.html
+
+# 0.4.3
+
+- Fix Dart 1.14 incompatibility further.
+
+# 0.4.2
+
+- Bad pub publish. Ignore.
+
+# 0.4.1
+
+- Fix Dart 1.14 incompatibility with packageRoot returning null.
+
+# 0.4.0
+
+- Remove usage of tuple package.
+- Upgrade unittest package to test.
+- Fix database URL for "latest" database.
+- Add tool/dartfmt for formatting source.
+
+# 0.3.1
+
+- `generate_data_subset` script is removed. It will be available as a
+  separate package.
+
+# 0.3.0
+
+- Time zone database updated to 2015b.
+- Removed local location detection heuristics (didn't worked properly).
+  Local location is initialized with UTC location by default, use
+  `setLocalLocation` to change local location.
+- Time zone database format is changed; data is aligned.
+
+# 0.2.5
+
+- Fixed bug with String formatting (invalid offsets for minutes).
+
+# 0.2.4
+
+- Fixed bug with Calendar-type constructor.
+
+# 0.2.3
+
+- Added `initializeTimeZoneSync` function for standalone environments.
+- Fixed bug with script path on Windows.
+
+# 0.2.2
+
+- TimeZone database updated to "2014j".
+- "args" and "path" moved from dev dependencies to dependencies.
+
+# 0.2.1
+
+- `tzfile` library renamed to `tzdata`.
+- Added `zone1970.tab` parser to `tzdata` library.
+- Removed `package:collection` dependency.
diff --git a/pkgs/repo_manage/test/data/changelog_complex_timezone_wip.md b/pkgs/repo_manage/test/data/changelog_complex_timezone_wip.md
new file mode 100644
index 00000000..a47c6d45
--- /dev/null
+++ b/pkgs/repo_manage/test/data/changelog_complex_timezone_wip.md
@@ -0,0 +1,297 @@
+## 0.11.1-wip
+
+- Specify `Etc/UTC` as the default timezone (replaces `UTC`)
+
+## 0.11.0
+
+- Make `Location.offset` a `Duration` instead of an `int`.
+- Generate list of common locations fom IANA data.
+- Move to `dart-lang/labs` monorepo.
+- Add timezone data version to generated headers.
+
+# 0.10.2
+
+- Upgrade minimum SDK to `^3.10.0` and the databases to [2025c].
+
+[2025c]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/TAGXKYLMAQRZRFTERQ33CEKOW7KRJVAK/
+
+# 0.10.1
+
+- Time zone database updated to 2025b. For your convenience here is the
+  announcement for [2025a], [2025b].
+- Added a `native` getter for `TZDateTime`. Thanks @klondikedragon!
+
+[2025a]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/MWII7R3HMCEDNUCIYQKSSTYYR7UWK4OQ/
+[2025b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/6JVHNHLB6I2WAYTQ75L6KEPEQHFXAJK3/
+
+# 0.10.0
+
+- Update time zone-updating script to use `rearguard.zi`.
+- Convert `browser.dart` to use `package:http` instead of `dart:html` for HTTP
+  requests.
+- Time zone database updated to 2024b. For your convenience here is the
+  announcement for [2024b].
+
+[2024b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/IZ7AO6WRE3W3TWBL5IR6PMQUL433BQIE/
+
+# 0.9.4
+
+- Support cross-isolate issues by overriding `hashCode` and `operator ==` on
+  class `Location`. (see #147)
+- Fix incorrect DST transition. (see #166)
+
+# 0.9.3
+
+- Time zone database updated to 2024a. For your convenience here are the
+  announcements for [2023d], [2024a].
+
+[2023d]: https://mm.icann.org/pipermail/tz-announce/2023-December.txt
+[2024a]: https://mm.icann.org/pipermail/tz-announce/2024-February.txt
+
+
+# 0.9.2
+
+- Time zone database updated to 2023c. For your convenience here are the
+  announcements for [2023a], [2023b], [2023c].
+
+[2023a]: https://mm.icann.org/pipermail/tz-announce/2023-March/000077.html
+[2023b]: https://mm.icann.org/pipermail/tz-announce/2023-March/000078.html
+[2023c]: https://mm.icann.org/pipermail/tz-announce/2023-March/000079.html
+
+# 0.9.1
+
+- Time zone database updated to 2022g. For your convenience here are the
+  announcements for [2022d], [2022e], [2022f], [2022g].
+
+[2022d]: https://mm.icann.org/pipermail/tz-announce/2022-September/000073.html
+[2022e]: https://mm.icann.org/pipermail/tz-announce/2022-October/000074.html
+[2022f]: https://mm.icann.org/pipermail/tz-announce/2022-October/000075.html
+[2022g]: https://mm.icann.org/pipermail/tz-announce/2022-November/000076.html
+
+# 0.9.0
+
+- Time zone database updated to 2022c. For your convenience here are the
+  announcements for [2022a], [2022b], [2022c].
+- Removed named database files in `lib/data` (for example, `lib/data/2021e.tzf`).
+  The only supported database files are all now named `latest_*`.
+
+[2022a]: https://mm.icann.org/pipermail/tz-announce/2022-March/000070.html
+[2022b]: https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html
+[2022c]: https://mm.icann.org/pipermail/tz-announce/2022-August/000072.html
+
+# 0.8.1
+
+- Time zone database updated to 2021e. For your convenience here are the
+  announcements for [2021b], [2021c], [2021d], [2021e].
+- Fixed encoding script to not skip a few missing time zones.
+
+[2021b]: https://mm.icann.org/pipermail/tz-announce/2021-September/000066.html
+[2021c]: https://mm.icann.org/pipermail/tz-announce/2021-October/000067.html
+[2021d]: https://mm.icann.org/pipermail/tz-announce/2021-October/000068.html
+[2021e]: https://mm.icann.org/pipermail/tz-announce/2021-October/000069.html
+
+# 0.8.0
+
+- Time zone database updated to 2021a. For your convenience here is the
+  announcement for [2021a].
+- Time zone databases encoded with UTF-16 instead of base64.
+- **Breaking change**: Remove `tool/encode.dart` in favor of
+  `tool/encode_dart.dart`.
+
+[2021a]: https://mm.icann.org/pipermail/tz-announce/2021-January/000065.html
+
+
+# 0.7.0
+
+- **Breaking change**: Change some of TimeZone's constructor parameters to be
+  named instead of positional.
+- **Breaking change**: Rename `TimeZone.abbr` to `TimeZone.abbreviation`.
+- Deprecate `LocationDatabase.isEmpty` in favor of
+  `LocationDatabase.isInitialized`.
+- Removed `new` usage from examples and fixed a typo in the `TZDateTime.from`
+  example.
+- Migrate to Dart's null safety language feature.
+
+# 0.6.1
+
+- Updated the `get` script (now `encode_tzf`) to work with a `zoneinfo`
+  directory (as created by the `zic` tool) as input. Fetching and compiling this
+  directory is now done by a bash script (`refresh.sh`) using standard tools.
+
+  This allows pointing the tool at a custom `zoneinfo` directory.
+
+# 0.6.0
+
+- Stopping internal versioning of time zone data. Only the latest data will be
+  included, as there is no use case for using an outdated version.
+- Renaming the `_2015_2025` database to `_10y` for it to have a stable name.
+  In the past `latest_2010-2020.tzf` had to be renamed to
+  `latest_2015-2025.tzf`.
+
+# 0.5.9
+
+- Time zone database updated to 2020d. For your convenience here is the
+  announcement for [2020d].
+
+[2020d]: https://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
+
+# 0.5.8
+
+- Time zone database updated to 2020b. For your convenience here is the
+  announcement for [2020b].
+
+[2020b]: https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
+
+# 0.5.7
+
+- Time zone database updated to 2020a. For your convenience here is the
+  announcement for [2020a].
+- Earlier null checking on some TZDateTime constructor arguments.
+- Many internal changes; should not affect API.
+
+[2020a]: https://mm.icann.org/pipermail/tz-announce/2020-April/000058.html
+
+# 0.5.6
+
+- Time zone database updated to 2019c. For your convenience here is the
+  announcement for [2019c].
+- Dart-importable databases made available in `lib/data`. README.md has more
+  details.
+
+[2019c]: https://mm.icann.org/pipermail/tz-announce/2019-September/000057.html
+
+# 0.5.5
+
+- Time zone database updated to 2019b. For your convenience here is the
+  announcement for [2019b].
+- Convenience database symlinks added for convenience at
+  - `lib/data/latest.tzf`
+  - `lib/data/latest_2015-2025.tzf`
+  - `lib/data/latest_all.tzf`
+
+[2019b]: https://mm.icann.org/pipermail/tz-announce/2019-July/000056.html
+
+# 0.5.4
+
+- TZDateTime.utc is accessible before time zone database is initialized (thanks
+  @jsmarr).
+- Fix dropping microseconds when creating TZDateTime (thanks @jsmarr).
+
+# 0.5.3
+
+- Time zone database updated to 2019a. For your convenience here is the
+  announcement for [2019a].
+
+[2019a]: https://mm.icann.org/pipermail/tz-announce/2019-March/000055.html
+
+# 0.5.2
+
+- Time zone database updated to 2018i. For your convenience here are the
+  announcements for [2018h] and [2018i].
+
+[2018h]: https://mm.icann.org/pipermail/tz-announce/2018-December/000053.html
+[2018i]: https://mm.icann.org/pipermail/tz-announce/2018-December/000054.html
+
+# 0.5.1
+
+- Time zone database updated to 2018g. For your convenience here are the
+  announcements for [2018d], [2018e], [2018f], and [2018g].
+
+[2018d]: https://mm.icann.org/pipermail/tz-announce/2018-March/000049.html
+[2018e]: https://mm.icann.org/pipermail/tz-announce/2018-May/000050.html
+[2018f]: https://mm.icann.org/pipermail/tz-announce/2018-October/000051.html
+[2018g]: https://mm.icann.org/pipermail/tz-announce/2018-October/000052.html
+
+# 0.5.0
+
+- Support a package-directory-free environment. In Dart 1.19, timezone is now
+  compatible with `pub get --no-packages-dir`.
+- **Breaking:** Remove initializeTimeZoneSync method; it is incompatible with
+  the async method for resolving package URIs.
+- Fix all strong mode _errors_ (thanks @har79).
+- Add microsecond support (thanks @har79).
+- Improve interaction between TZDateTime and native DateTime (thanks @har79).
+- Fix TimeZone's `==` (thanks @har79).
+- Many new dartdoc comments (thanks @har79).
+- Fix for calling `new TZDateTime.from()` with a non-UTC DateTime object
+  (thanks @tomaine2002).
+- Support Dart 2.
+- Time zone database updated to 2018c. For your convenience here are the
+  announcements for [2015c], [2015d], [2015e], [2015f], [2015g], [2016a],
+  [2016b], [2016c], [2016d], [2016e], [2016f], [2016g], [2016h], [2016i],
+  [2017a], [2017b], [2017c], and [2018c].
+
+[2015c]: https://mm.icann.org/pipermail/tz-announce/2015-April/000030.html
+[2015d]: https://mm.icann.org/pipermail/tz-announce/2015-April/000031.html
+[2015e]: https://mm.icann.org/pipermail/tz-announce/2015-June/000032.html
+[2015f]: https://mm.icann.org/pipermail/tz-announce/2015-August/000033.html
+[2015g]: https://mm.icann.org/pipermail/tz-announce/2015-October/000034.html
+[2016a]: https://mm.icann.org/pipermail/tz-announce/2016-January/000035.html
+[2016b]: https://mm.icann.org/pipermail/tz-announce/2016-March/000036.html
+[2016c]: https://mm.icann.org/pipermail/tz-announce/2016-March/000037.html
+[2016d]: https://mm.icann.org/pipermail/tz-announce/2016-April/000038.html
+[2016e]: https://mm.icann.org/pipermail/tz-announce/2016-June/000039.html
+[2016f]: https://mm.icann.org/pipermail/tz-announce/2016-July/000040.html
+[2016g]: https://mm.icann.org/pipermail/tz-announce/2016-September/000041.html
+[2016h]: https://mm.icann.org/pipermail/tz-announce/2016-October/000042.html
+[2016i]: https://mm.icann.org/pipermail/tz-announce/2016-November/000043.html
+[2017a]: https://mm.icann.org/pipermail/tz-announce/2017-February/000045.html
+[2017b]: https://mm.icann.org/pipermail/tz-announce/2017-March/000046.html
+[2017c]: https://mm.icann.org/pipermail/tz-announce/2017-October/000047.html
+[2018c]: https://mm.icann.org/pipermail/tz-announce/2018-January/000048.html
+
+# 0.4.3
+
+- Fix Dart 1.14 incompatibility further.
+
+# 0.4.2
+
+- Bad pub publish. Ignore.
+
+# 0.4.1
+
+- Fix Dart 1.14 incompatibility with packageRoot returning null.
+
+# 0.4.0
+
+- Remove usage of tuple package.
+- Upgrade unittest package to test.
+- Fix database URL for "latest" database.
+- Add tool/dartfmt for formatting source.
+
+# 0.3.1
+
+- `generate_data_subset` script is removed. It will be available as a
+  separate package.
+
+# 0.3.0
+
+- Time zone database updated to 2015b.
+- Removed local location detection heuristics (didn't worked properly).
+  Local location is initialized with UTC location by default, use
+  `setLocalLocation` to change local location.
+- Time zone database format is changed; data is aligned.
+
+# 0.2.5
+
+- Fixed bug with String formatting (invalid offsets for minutes).
+
+# 0.2.4
+
+- Fixed bug with Calendar-type constructor.
+
+# 0.2.3
+
+- Added `initializeTimeZoneSync` function for standalone environments.
+- Fixed bug with script path on Windows.
+
+# 0.2.2
+
+- TimeZone database updated to "2014j".
+- "args" and "path" moved from dev dependencies to dependencies.
+
+# 0.2.1
+
+- `tzfile` library renamed to `tzdata`.
+- Added `zone1970.tab` parser to `tzdata` library.
+- Removed `package:collection` dependency.
diff --git a/pkgs/repo_manage/test/data/changelog_empty.md b/pkgs/repo_manage/test/data/changelog_empty.md
new file mode 100644
index 00000000..e69de29b
diff --git a/pkgs/repo_manage/test/data/changelog_release.md b/pkgs/repo_manage/test/data/changelog_release.md
new file mode 100644
index 00000000..3f34d9cc
--- /dev/null
+++ b/pkgs/repo_manage/test/data/changelog_release.md
@@ -0,0 +1,3 @@
+## 1.2.3
+
+- Released item
diff --git a/pkgs/repo_manage/test/data/changelog_wip.md b/pkgs/repo_manage/test/data/changelog_wip.md
new file mode 100644
index 00000000..4b76147a
--- /dev/null
+++ b/pkgs/repo_manage/test/data/changelog_wip.md
@@ -0,0 +1,3 @@
+## 1.2.3-wip
+
+- Existing work item
diff --git a/pkgs/repo_manage/test/data/golden/changelog_complex_timezone.golden b/pkgs/repo_manage/test/data/golden/changelog_complex_timezone.golden
new file mode 100644
index 00000000..31b0c1c9
--- /dev/null
+++ b/pkgs/repo_manage/test/data/golden/changelog_complex_timezone.golden
@@ -0,0 +1,301 @@
+## 0.11.1-wip
+
+- Add new feature
+
+## 0.11.1
+
+- Specify `Etc/UTC` as the default timezone (replaces `UTC`)
+
+## 0.11.0
+
+- Make `Location.offset` a `Duration` instead of an `int`.
+- Generate list of common locations fom IANA data.
+- Move to `dart-lang/labs` monorepo.
+- Add timezone data version to generated headers.
+
+# 0.10.2
+
+- Upgrade minimum SDK to `^3.10.0` and the databases to [2025c].
+
+[2025c]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/TAGXKYLMAQRZRFTERQ33CEKOW7KRJVAK/
+
+# 0.10.1
+
+- Time zone database updated to 2025b. For your convenience here is the
+  announcement for [2025a], [2025b].
+- Added a `native` getter for `TZDateTime`. Thanks @klondikedragon!
+
+[2025a]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/MWII7R3HMCEDNUCIYQKSSTYYR7UWK4OQ/
+[2025b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/6JVHNHLB6I2WAYTQ75L6KEPEQHFXAJK3/
+
+# 0.10.0
+
+- Update time zone-updating script to use `rearguard.zi`.
+- Convert `browser.dart` to use `package:http` instead of `dart:html` for HTTP
+  requests.
+- Time zone database updated to 2024b. For your convenience here is the
+  announcement for [2024b].
+
+[2024b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/IZ7AO6WRE3W3TWBL5IR6PMQUL433BQIE/
+
+# 0.9.4
+
+- Support cross-isolate issues by overriding `hashCode` and `operator ==` on
+  class `Location`. (see #147)
+- Fix incorrect DST transition. (see #166)
+
+# 0.9.3
+
+- Time zone database updated to 2024a. For your convenience here are the
+  announcements for [2023d], [2024a].
+
+[2023d]: https://mm.icann.org/pipermail/tz-announce/2023-December.txt
+[2024a]: https://mm.icann.org/pipermail/tz-announce/2024-February.txt
+
+
+# 0.9.2
+
+- Time zone database updated to 2023c. For your convenience here are the
+  announcements for [2023a], [2023b], [2023c].
+
+[2023a]: https://mm.icann.org/pipermail/tz-announce/2023-March/000077.html
+[2023b]: https://mm.icann.org/pipermail/tz-announce/2023-March/000078.html
+[2023c]: https://mm.icann.org/pipermail/tz-announce/2023-March/000079.html
+
+# 0.9.1
+
+- Time zone database updated to 2022g. For your convenience here are the
+  announcements for [2022d], [2022e], [2022f], [2022g].
+
+[2022d]: https://mm.icann.org/pipermail/tz-announce/2022-September/000073.html
+[2022e]: https://mm.icann.org/pipermail/tz-announce/2022-October/000074.html
+[2022f]: https://mm.icann.org/pipermail/tz-announce/2022-October/000075.html
+[2022g]: https://mm.icann.org/pipermail/tz-announce/2022-November/000076.html
+
+# 0.9.0
+
+- Time zone database updated to 2022c. For your convenience here are the
+  announcements for [2022a], [2022b], [2022c].
+- Removed named database files in `lib/data` (for example, `lib/data/2021e.tzf`).
+  The only supported database files are all now named `latest_*`.
+
+[2022a]: https://mm.icann.org/pipermail/tz-announce/2022-March/000070.html
+[2022b]: https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html
+[2022c]: https://mm.icann.org/pipermail/tz-announce/2022-August/000072.html
+
+# 0.8.1
+
+- Time zone database updated to 2021e. For your convenience here are the
+  announcements for [2021b], [2021c], [2021d], [2021e].
+- Fixed encoding script to not skip a few missing time zones.
+
+[2021b]: https://mm.icann.org/pipermail/tz-announce/2021-September/000066.html
+[2021c]: https://mm.icann.org/pipermail/tz-announce/2021-October/000067.html
+[2021d]: https://mm.icann.org/pipermail/tz-announce/2021-October/000068.html
+[2021e]: https://mm.icann.org/pipermail/tz-announce/2021-October/000069.html
+
+# 0.8.0
+
+- Time zone database updated to 2021a. For your convenience here is the
+  announcement for [2021a].
+- Time zone databases encoded with UTF-16 instead of base64.
+- **Breaking change**: Remove `tool/encode.dart` in favor of
+  `tool/encode_dart.dart`.
+
+[2021a]: https://mm.icann.org/pipermail/tz-announce/2021-January/000065.html
+
+
+# 0.7.0
+
+- **Breaking change**: Change some of TimeZone's constructor parameters to be
+  named instead of positional.
+- **Breaking change**: Rename `TimeZone.abbr` to `TimeZone.abbreviation`.
+- Deprecate `LocationDatabase.isEmpty` in favor of
+  `LocationDatabase.isInitialized`.
+- Removed `new` usage from examples and fixed a typo in the `TZDateTime.from`
+  example.
+- Migrate to Dart's null safety language feature.
+
+# 0.6.1
+
+- Updated the `get` script (now `encode_tzf`) to work with a `zoneinfo`
+  directory (as created by the `zic` tool) as input. Fetching and compiling this
+  directory is now done by a bash script (`refresh.sh`) using standard tools.
+
+  This allows pointing the tool at a custom `zoneinfo` directory.
+
+# 0.6.0
+
+- Stopping internal versioning of time zone data. Only the latest data will be
+  included, as there is no use case for using an outdated version.
+- Renaming the `_2015_2025` database to `_10y` for it to have a stable name.
+  In the past `latest_2010-2020.tzf` had to be renamed to
+  `latest_2015-2025.tzf`.
+
+# 0.5.9
+
+- Time zone database updated to 2020d. For your convenience here is the
+  announcement for [2020d].
+
+[2020d]: https://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
+
+# 0.5.8
+
+- Time zone database updated to 2020b. For your convenience here is the
+  announcement for [2020b].
+
+[2020b]: https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
+
+# 0.5.7
+
+- Time zone database updated to 2020a. For your convenience here is the
+  announcement for [2020a].
+- Earlier null checking on some TZDateTime constructor arguments.
+- Many internal changes; should not affect API.
+
+[2020a]: https://mm.icann.org/pipermail/tz-announce/2020-April/000058.html
+
+# 0.5.6
+
+- Time zone database updated to 2019c. For your convenience here is the
+  announcement for [2019c].
+- Dart-importable databases made available in `lib/data`. README.md has more
+  details.
+
+[2019c]: https://mm.icann.org/pipermail/tz-announce/2019-September/000057.html
+
+# 0.5.5
+
+- Time zone database updated to 2019b. For your convenience here is the
+  announcement for [2019b].
+- Convenience database symlinks added for convenience at
+  - `lib/data/latest.tzf`
+  - `lib/data/latest_2015-2025.tzf`
+  - `lib/data/latest_all.tzf`
+
+[2019b]: https://mm.icann.org/pipermail/tz-announce/2019-July/000056.html
+
+# 0.5.4
+
+- TZDateTime.utc is accessible before time zone database is initialized (thanks
+  @jsmarr).
+- Fix dropping microseconds when creating TZDateTime (thanks @jsmarr).
+
+# 0.5.3
+
+- Time zone database updated to 2019a. For your convenience here is the
+  announcement for [2019a].
+
+[2019a]: https://mm.icann.org/pipermail/tz-announce/2019-March/000055.html
+
+# 0.5.2
+
+- Time zone database updated to 2018i. For your convenience here are the
+  announcements for [2018h] and [2018i].
+
+[2018h]: https://mm.icann.org/pipermail/tz-announce/2018-December/000053.html
+[2018i]: https://mm.icann.org/pipermail/tz-announce/2018-December/000054.html
+
+# 0.5.1
+
+- Time zone database updated to 2018g. For your convenience here are the
+  announcements for [2018d], [2018e], [2018f], and [2018g].
+
+[2018d]: https://mm.icann.org/pipermail/tz-announce/2018-March/000049.html
+[2018e]: https://mm.icann.org/pipermail/tz-announce/2018-May/000050.html
+[2018f]: https://mm.icann.org/pipermail/tz-announce/2018-October/000051.html
+[2018g]: https://mm.icann.org/pipermail/tz-announce/2018-October/000052.html
+
+# 0.5.0
+
+- Support a package-directory-free environment. In Dart 1.19, timezone is now
+  compatible with `pub get --no-packages-dir`.
+- **Breaking:** Remove initializeTimeZoneSync method; it is incompatible with
+  the async method for resolving package URIs.
+- Fix all strong mode _errors_ (thanks @har79).
+- Add microsecond support (thanks @har79).
+- Improve interaction between TZDateTime and native DateTime (thanks @har79).
+- Fix TimeZone's `==` (thanks @har79).
+- Many new dartdoc comments (thanks @har79).
+- Fix for calling `new TZDateTime.from()` with a non-UTC DateTime object
+  (thanks @tomaine2002).
+- Support Dart 2.
+- Time zone database updated to 2018c. For your convenience here are the
+  announcements for [2015c], [2015d], [2015e], [2015f], [2015g], [2016a],
+  [2016b], [2016c], [2016d], [2016e], [2016f], [2016g], [2016h], [2016i],
+  [2017a], [2017b], [2017c], and [2018c].
+
+[2015c]: https://mm.icann.org/pipermail/tz-announce/2015-April/000030.html
+[2015d]: https://mm.icann.org/pipermail/tz-announce/2015-April/000031.html
+[2015e]: https://mm.icann.org/pipermail/tz-announce/2015-June/000032.html
+[2015f]: https://mm.icann.org/pipermail/tz-announce/2015-August/000033.html
+[2015g]: https://mm.icann.org/pipermail/tz-announce/2015-October/000034.html
+[2016a]: https://mm.icann.org/pipermail/tz-announce/2016-January/000035.html
+[2016b]: https://mm.icann.org/pipermail/tz-announce/2016-March/000036.html
+[2016c]: https://mm.icann.org/pipermail/tz-announce/2016-March/000037.html
+[2016d]: https://mm.icann.org/pipermail/tz-announce/2016-April/000038.html
+[2016e]: https://mm.icann.org/pipermail/tz-announce/2016-June/000039.html
+[2016f]: https://mm.icann.org/pipermail/tz-announce/2016-July/000040.html
+[2016g]: https://mm.icann.org/pipermail/tz-announce/2016-September/000041.html
+[2016h]: https://mm.icann.org/pipermail/tz-announce/2016-October/000042.html
+[2016i]: https://mm.icann.org/pipermail/tz-announce/2016-November/000043.html
+[2017a]: https://mm.icann.org/pipermail/tz-announce/2017-February/000045.html
+[2017b]: https://mm.icann.org/pipermail/tz-announce/2017-March/000046.html
+[2017c]: https://mm.icann.org/pipermail/tz-announce/2017-October/000047.html
+[2018c]: https://mm.icann.org/pipermail/tz-announce/2018-January/000048.html
+
+# 0.4.3
+
+- Fix Dart 1.14 incompatibility further.
+
+# 0.4.2
+
+- Bad pub publish. Ignore.
+
+# 0.4.1
+
+- Fix Dart 1.14 incompatibility with packageRoot returning null.
+
+# 0.4.0
+
+- Remove usage of tuple package.
+- Upgrade unittest package to test.
+- Fix database URL for "latest" database.
+- Add tool/dartfmt for formatting source.
+
+# 0.3.1
+
+- `generate_data_subset` script is removed. It will be available as a
+  separate package.
+
+# 0.3.0
+
+- Time zone database updated to 2015b.
+- Removed local location detection heuristics (didn't worked properly).
+  Local location is initialized with UTC location by default, use
+  `setLocalLocation` to change local location.
+- Time zone database format is changed; data is aligned.
+
+# 0.2.5
+
+- Fixed bug with String formatting (invalid offsets for minutes).
+
+# 0.2.4
+
+- Fixed bug with Calendar-type constructor.
+
+# 0.2.3
+
+- Added `initializeTimeZoneSync` function for standalone environments.
+- Fixed bug with script path on Windows.
+
+# 0.2.2
+
+- TimeZone database updated to "2014j".
+- "args" and "path" moved from dev dependencies to dependencies.
+
+# 0.2.1
+
+- `tzfile` library renamed to `tzdata`.
+- Added `zone1970.tab` parser to `tzdata` library.
+- Removed `package:collection` dependency.
diff --git a/pkgs/repo_manage/test/data/golden/changelog_complex_timezone_wip.golden b/pkgs/repo_manage/test/data/golden/changelog_complex_timezone_wip.golden
new file mode 100644
index 00000000..48c558bf
--- /dev/null
+++ b/pkgs/repo_manage/test/data/golden/changelog_complex_timezone_wip.golden
@@ -0,0 +1,298 @@
+## 0.11.1-wip
+
+- Specify `Etc/UTC` as the default timezone (replaces `UTC`)
+- Add new feature
+
+## 0.11.0
+
+- Make `Location.offset` a `Duration` instead of an `int`.
+- Generate list of common locations fom IANA data.
+- Move to `dart-lang/labs` monorepo.
+- Add timezone data version to generated headers.
+
+# 0.10.2
+
+- Upgrade minimum SDK to `^3.10.0` and the databases to [2025c].
+
+[2025c]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/TAGXKYLMAQRZRFTERQ33CEKOW7KRJVAK/
+
+# 0.10.1
+
+- Time zone database updated to 2025b. For your convenience here is the
+  announcement for [2025a], [2025b].
+- Added a `native` getter for `TZDateTime`. Thanks @klondikedragon!
+
+[2025a]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/MWII7R3HMCEDNUCIYQKSSTYYR7UWK4OQ/
+[2025b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/6JVHNHLB6I2WAYTQ75L6KEPEQHFXAJK3/
+
+# 0.10.0
+
+- Update time zone-updating script to use `rearguard.zi`.
+- Convert `browser.dart` to use `package:http` instead of `dart:html` for HTTP
+  requests.
+- Time zone database updated to 2024b. For your convenience here is the
+  announcement for [2024b].
+
+[2024b]: https://lists.iana.org/hyperkitty/list/tz-announce@iana.org/thread/IZ7AO6WRE3W3TWBL5IR6PMQUL433BQIE/
+
+# 0.9.4
+
+- Support cross-isolate issues by overriding `hashCode` and `operator ==` on
+  class `Location`. (see #147)
+- Fix incorrect DST transition. (see #166)
+
+# 0.9.3
+
+- Time zone database updated to 2024a. For your convenience here are the
+  announcements for [2023d], [2024a].
+
+[2023d]: https://mm.icann.org/pipermail/tz-announce/2023-December.txt
+[2024a]: https://mm.icann.org/pipermail/tz-announce/2024-February.txt
+
+
+# 0.9.2
+
+- Time zone database updated to 2023c. For your convenience here are the
+  announcements for [2023a], [2023b], [2023c].
+
+[2023a]: https://mm.icann.org/pipermail/tz-announce/2023-March/000077.html
+[2023b]: https://mm.icann.org/pipermail/tz-announce/2023-March/000078.html
+[2023c]: https://mm.icann.org/pipermail/tz-announce/2023-March/000079.html
+
+# 0.9.1
+
+- Time zone database updated to 2022g. For your convenience here are the
+  announcements for [2022d], [2022e], [2022f], [2022g].
+
+[2022d]: https://mm.icann.org/pipermail/tz-announce/2022-September/000073.html
+[2022e]: https://mm.icann.org/pipermail/tz-announce/2022-October/000074.html
+[2022f]: https://mm.icann.org/pipermail/tz-announce/2022-October/000075.html
+[2022g]: https://mm.icann.org/pipermail/tz-announce/2022-November/000076.html
+
+# 0.9.0
+
+- Time zone database updated to 2022c. For your convenience here are the
+  announcements for [2022a], [2022b], [2022c].
+- Removed named database files in `lib/data` (for example, `lib/data/2021e.tzf`).
+  The only supported database files are all now named `latest_*`.
+
+[2022a]: https://mm.icann.org/pipermail/tz-announce/2022-March/000070.html
+[2022b]: https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html
+[2022c]: https://mm.icann.org/pipermail/tz-announce/2022-August/000072.html
+
+# 0.8.1
+
+- Time zone database updated to 2021e. For your convenience here are the
+  announcements for [2021b], [2021c], [2021d], [2021e].
+- Fixed encoding script to not skip a few missing time zones.
+
+[2021b]: https://mm.icann.org/pipermail/tz-announce/2021-September/000066.html
+[2021c]: https://mm.icann.org/pipermail/tz-announce/2021-October/000067.html
+[2021d]: https://mm.icann.org/pipermail/tz-announce/2021-October/000068.html
+[2021e]: https://mm.icann.org/pipermail/tz-announce/2021-October/000069.html
+
+# 0.8.0
+
+- Time zone database updated to 2021a. For your convenience here is the
+  announcement for [2021a].
+- Time zone databases encoded with UTF-16 instead of base64.
+- **Breaking change**: Remove `tool/encode.dart` in favor of
+  `tool/encode_dart.dart`.
+
+[2021a]: https://mm.icann.org/pipermail/tz-announce/2021-January/000065.html
+
+
+# 0.7.0
+
+- **Breaking change**: Change some of TimeZone's constructor parameters to be
+  named instead of positional.
+- **Breaking change**: Rename `TimeZone.abbr` to `TimeZone.abbreviation`.
+- Deprecate `LocationDatabase.isEmpty` in favor of
+  `LocationDatabase.isInitialized`.
+- Removed `new` usage from examples and fixed a typo in the `TZDateTime.from`
+  example.
+- Migrate to Dart's null safety language feature.
+
+# 0.6.1
+
+- Updated the `get` script (now `encode_tzf`) to work with a `zoneinfo`
+  directory (as created by the `zic` tool) as input. Fetching and compiling this
+  directory is now done by a bash script (`refresh.sh`) using standard tools.
+
+  This allows pointing the tool at a custom `zoneinfo` directory.
+
+# 0.6.0
+
+- Stopping internal versioning of time zone data. Only the latest data will be
+  included, as there is no use case for using an outdated version.
+- Renaming the `_2015_2025` database to `_10y` for it to have a stable name.
+  In the past `latest_2010-2020.tzf` had to be renamed to
+  `latest_2015-2025.tzf`.
+
+# 0.5.9
+
+- Time zone database updated to 2020d. For your convenience here is the
+  announcement for [2020d].
+
+[2020d]: https://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
+
+# 0.5.8
+
+- Time zone database updated to 2020b. For your convenience here is the
+  announcement for [2020b].
+
+[2020b]: https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
+
+# 0.5.7
+
+- Time zone database updated to 2020a. For your convenience here is the
+  announcement for [2020a].
+- Earlier null checking on some TZDateTime constructor arguments.
+- Many internal changes; should not affect API.
+
+[2020a]: https://mm.icann.org/pipermail/tz-announce/2020-April/000058.html
+
+# 0.5.6
+
+- Time zone database updated to 2019c. For your convenience here is the
+  announcement for [2019c].
+- Dart-importable databases made available in `lib/data`. README.md has more
+  details.
+
+[2019c]: https://mm.icann.org/pipermail/tz-announce/2019-September/000057.html
+
+# 0.5.5
+
+- Time zone database updated to 2019b. For your convenience here is the
+  announcement for [2019b].
+- Convenience database symlinks added for convenience at
+  - `lib/data/latest.tzf`
+  - `lib/data/latest_2015-2025.tzf`
+  - `lib/data/latest_all.tzf`
+
+[2019b]: https://mm.icann.org/pipermail/tz-announce/2019-July/000056.html
+
+# 0.5.4
+
+- TZDateTime.utc is accessible before time zone database is initialized (thanks
+  @jsmarr).
+- Fix dropping microseconds when creating TZDateTime (thanks @jsmarr).
+
+# 0.5.3
+
+- Time zone database updated to 2019a. For your convenience here is the
+  announcement for [2019a].
+
+[2019a]: https://mm.icann.org/pipermail/tz-announce/2019-March/000055.html
+
+# 0.5.2
+
+- Time zone database updated to 2018i. For your convenience here are the
+  announcements for [2018h] and [2018i].
+
+[2018h]: https://mm.icann.org/pipermail/tz-announce/2018-December/000053.html
+[2018i]: https://mm.icann.org/pipermail/tz-announce/2018-December/000054.html
+
+# 0.5.1
+
+- Time zone database updated to 2018g. For your convenience here are the
+  announcements for [2018d], [2018e], [2018f], and [2018g].
+
+[2018d]: https://mm.icann.org/pipermail/tz-announce/2018-March/000049.html
+[2018e]: https://mm.icann.org/pipermail/tz-announce/2018-May/000050.html
+[2018f]: https://mm.icann.org/pipermail/tz-announce/2018-October/000051.html
+[2018g]: https://mm.icann.org/pipermail/tz-announce/2018-October/000052.html
+
+# 0.5.0
+
+- Support a package-directory-free environment. In Dart 1.19, timezone is now
+  compatible with `pub get --no-packages-dir`.
+- **Breaking:** Remove initializeTimeZoneSync method; it is incompatible with
+  the async method for resolving package URIs.
+- Fix all strong mode _errors_ (thanks @har79).
+- Add microsecond support (thanks @har79).
+- Improve interaction between TZDateTime and native DateTime (thanks @har79).
+- Fix TimeZone's `==` (thanks @har79).
+- Many new dartdoc comments (thanks @har79).
+- Fix for calling `new TZDateTime.from()` with a non-UTC DateTime object
+  (thanks @tomaine2002).
+- Support Dart 2.
+- Time zone database updated to 2018c. For your convenience here are the
+  announcements for [2015c], [2015d], [2015e], [2015f], [2015g], [2016a],
+  [2016b], [2016c], [2016d], [2016e], [2016f], [2016g], [2016h], [2016i],
+  [2017a], [2017b], [2017c], and [2018c].
+
+[2015c]: https://mm.icann.org/pipermail/tz-announce/2015-April/000030.html
+[2015d]: https://mm.icann.org/pipermail/tz-announce/2015-April/000031.html
+[2015e]: https://mm.icann.org/pipermail/tz-announce/2015-June/000032.html
+[2015f]: https://mm.icann.org/pipermail/tz-announce/2015-August/000033.html
+[2015g]: https://mm.icann.org/pipermail/tz-announce/2015-October/000034.html
+[2016a]: https://mm.icann.org/pipermail/tz-announce/2016-January/000035.html
+[2016b]: https://mm.icann.org/pipermail/tz-announce/2016-March/000036.html
+[2016c]: https://mm.icann.org/pipermail/tz-announce/2016-March/000037.html
+[2016d]: https://mm.icann.org/pipermail/tz-announce/2016-April/000038.html
+[2016e]: https://mm.icann.org/pipermail/tz-announce/2016-June/000039.html
+[2016f]: https://mm.icann.org/pipermail/tz-announce/2016-July/000040.html
+[2016g]: https://mm.icann.org/pipermail/tz-announce/2016-September/000041.html
+[2016h]: https://mm.icann.org/pipermail/tz-announce/2016-October/000042.html
+[2016i]: https://mm.icann.org/pipermail/tz-announce/2016-November/000043.html
+[2017a]: https://mm.icann.org/pipermail/tz-announce/2017-February/000045.html
+[2017b]: https://mm.icann.org/pipermail/tz-announce/2017-March/000046.html
+[2017c]: https://mm.icann.org/pipermail/tz-announce/2017-October/000047.html
+[2018c]: https://mm.icann.org/pipermail/tz-announce/2018-January/000048.html
+
+# 0.4.3
+
+- Fix Dart 1.14 incompatibility further.
+
+# 0.4.2
+
+- Bad pub publish. Ignore.
+
+# 0.4.1
+
+- Fix Dart 1.14 incompatibility with packageRoot returning null.
+
+# 0.4.0
+
+- Remove usage of tuple package.
+- Upgrade unittest package to test.
+- Fix database URL for "latest" database.
+- Add tool/dartfmt for formatting source.
+
+# 0.3.1
+
+- `generate_data_subset` script is removed. It will be available as a
+  separate package.
+
+# 0.3.0
+
+- Time zone database updated to 2015b.
+- Removed local location detection heuristics (didn't worked properly).
+  Local location is initialized with UTC location by default, use
+  `setLocalLocation` to change local location.
+- Time zone database format is changed; data is aligned.
+
+# 0.2.5
+
+- Fixed bug with String formatting (invalid offsets for minutes).
+
+# 0.2.4
+
+- Fixed bug with Calendar-type constructor.
+
+# 0.2.3
+
+- Added `initializeTimeZoneSync` function for standalone environments.
+- Fixed bug with script path on Windows.
+
+# 0.2.2
+
+- TimeZone database updated to "2014j".
+- "args" and "path" moved from dev dependencies to dependencies.
+
+# 0.2.1
+
+- `tzfile` library renamed to `tzdata`.
+- Added `zone1970.tab` parser to `tzdata` library.
+- Removed `package:collection` dependency.
diff --git a/pkgs/repo_manage/test/data/golden/changelog_empty.golden b/pkgs/repo_manage/test/data/golden/changelog_empty.golden
new file mode 100644
index 00000000..a515a4fb
--- /dev/null
+++ b/pkgs/repo_manage/test/data/golden/changelog_empty.golden
@@ -0,0 +1,4 @@
+## 0.0.1-wip
+
+- Initial entry
+
diff --git a/pkgs/repo_manage/test/data/golden/changelog_release.golden b/pkgs/repo_manage/test/data/golden/changelog_release.golden
new file mode 100644
index 00000000..7a644991
--- /dev/null
+++ b/pkgs/repo_manage/test/data/golden/changelog_release.golden
@@ -0,0 +1,7 @@
+## 1.2.3-wip
+
+- Fix regression
+
+## 1.2.3
+
+- Released item
diff --git a/pkgs/repo_manage/test/data/golden/changelog_wip.golden b/pkgs/repo_manage/test/data/golden/changelog_wip.golden
new file mode 100644
index 00000000..218afaba
--- /dev/null
+++ b/pkgs/repo_manage/test/data/golden/changelog_wip.golden
@@ -0,0 +1,4 @@
+## 1.2.3-wip
+
+- Existing work item
+- Add new feature