How do I change timezone on Zabbix server running in Docker?

[treefox]

I noticed my graphs on my server have the incorrect time. I am using Docker to run a Zabbix server, but I do not where the correct file is to change the timezone from the default (I believe it is using Europe/Riga) . I used

sudo docker pull zabbix/zabbix-server-mysql

to get the image, and docker-compose_v3_ubuntu_mysql_latest.yaml to run the container. I used this tutorial to install the Docker: https://www.youtube.com/watch?v=eycKS8Nbv7o. For future reference, when using Zabbix Docker, are all the files that I change contained within the image? So I would always have to go into the image folder to find a file related to my Zabbix Docker Server?

[kloczek]

Internally zabbix is using GMT for all time stams.
All what you can change is time zone of the web frontend and you can do this changing time zone in php.ini.

[Atsushi]

If it is the timezone of the web front end, specify the environment variable PHP_TZ and start the container.
If you are using docker-compose_v3_ubuntu_mysql_latest.yaml, you can specify it in .env_web.

ex.

https://github.com/zabbix/zabbix-docker/blob/4.4/.env_web