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).