docker image does not recognise timezone appropriately

[instantdreams]

Description

Date on host reports according to timezone. Date on container reports in UTC.

Configuration

1. Create a mosquitto compose.yaml file:

compose.yaml

services:
  mosquitto:
    image: eclipse-mosquitto:latest
    container_name: mqtt
    hostname: mqtt
    ports:
      - 1883:1883 # mqtt
      - 9001:9001 # websockets
    environment:
      - TZ=America/Edmonton
    volumes:
      - /srv/mqtt/config:/mosquitto/config
      - /srv/mqtt/data:/mosquitto/data
      - /srv/mqtt/log:/mosquitto/log
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
    restart: unless-stopped

2. Run compose file using docker compose up --detach

Reproducing Issue

1. Ensure the container is running
2. Issue the following commands:

$ docker exec mqtt date
Tue Apr 16 15:35:43 UTC 2024
$ docker exec mqtt cat /etc/timezone
America/Edmonton

3. Confirm container is running successfully

Environment

• Docker Compose version v2.24.7
• Docker version 25.0.4, build 1a576c5
• mosquitto version 2.0.18

Expectation

To rebuild the mqtt docker container to include the tzdata component so it is timezone aware, or to implement another process to support timezones.