From 1fc0c1b18b71a0c83842b83d5df595af14124a8e Mon Sep 17 00:00:00 2001
From: Erich Blume <blume.erich@gmail.com>
Date: Wed, 11 Feb 2026 21:27:35 -0800
Subject: [PATCH] Fix Dagger towncrier container using UTC instead of local
 time (#167)
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## Summary
- The `build_changelog` Dagger container (`python:3.12-slim`) defaults to UTC, causing towncrier to stamp tomorrow's date when releases are cut in the evening PST.
- This is the root cause of the docs website (built via Dagger) showing Feb 12 while the repo CHANGELOG (built directly on the runner) correctly showed Feb 11.
- Fix: set `TZ=America/Los_Angeles` in the Dagger container before running towncrier.

## Verified
- `docker run --rm python:3.12-slim` → `towncrier _get_date()` returns `2026-02-12` (wrong)
- `docker run --rm -e TZ=America/Los_Angeles python:3.12-slim` → returns `2026-02-11` (correct)

## Test plan
- [ ] Merge, then trigger a build-blumeops release
- [ ] Verify the CHANGELOG date on https://docs.eblu.me/CHANGELOG matches the repo

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/167
---
 .dagger/src/blumeops_ci/main.py                    | 1 +
 docs/changelog.d/fix-dagger-towncrier-tz.bugfix.md | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 docs/changelog.d/fix-dagger-towncrier-tz.bugfix.md

diff --git a/.dagger/src/blumeops_ci/main.py b/.dagger/src/blumeops_ci/main.py
index 851720d..2b780ac 100644
--- a/.dagger/src/blumeops_ci/main.py
+++ b/.dagger/src/blumeops_ci/main.py
@@ -31,6 +31,7 @@ class BlumeopsCi:
         return await (
             dag.container()
             .from_("python:3.12-slim")
+            .with_env_variable("TZ", "America/Los_Angeles")
             # git is required because towncrier stages CHANGELOG.md via git add
             .with_exec(["apt-get", "update", "-qq"])
             .with_exec(["apt-get", "install", "-y", "-qq", "git"])
diff --git a/docs/changelog.d/fix-dagger-towncrier-tz.bugfix.md b/docs/changelog.d/fix-dagger-towncrier-tz.bugfix.md
new file mode 100644
index 0000000..dc18699
--- /dev/null
+++ b/docs/changelog.d/fix-dagger-towncrier-tz.bugfix.md
@@ -0,0 +1 @@
+Set ``TZ=America/Los_Angeles`` in the Dagger ``build_changelog`` container so towncrier stamps the correct local date instead of UTC (which showed tomorrow's date for evening releases).