diff --git a/container-compose.yml b/container-compose.yml
index 69e49db8..a6cee3c8 100644
--- a/container-compose.yml
+++ b/container-compose.yml
@@ -145,6 +145,8 @@ services:
         - watcher_source=./watcher
         - denis_source=./denis
         - orbit_source=./orbit
+    environment:
+      TZ: ${SINGULARITY_TIMEZONE}
     volumes:
       - type: volume
         source: email-mail
diff --git a/mailman/Containerfile b/mailman/Containerfile
index ff2f615b..4003d967 100644
--- a/mailman/Containerfile
+++ b/mailman/Containerfile
@@ -13,6 +13,7 @@ FROM alpine:3.20 AS mailman
 RUN apk add \
 	py3-peewee \
 	py3-gitpython \
+	tzdata \
 	;