I try to run a Docker container with the same timezone as my Docker host. The host timezone is
When I run :
Thu Apr 16 11:04:11 CEST 2020
$ docker run -e TZ=CEST debian:buster date
Thu Apr 16 09:04:14 CEST 2020
The container is 2 hours behind the host.
On the other hand, if I set
TZ=Europe/Paris, it works as expected :
$ docker run -e TZ=Europe/Paris debian:buster date
Thu Apr 16 11:04:22 CEST 2020
Is this a bug or am I missing something?
The timezone is set by default and you need to change it manually.
There are some options:
Set it in the Dockerfile:
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
Using volumes to synchronize with your host:
docker run -v /etc/timezone:/etc/timezone:ro
Finally, set it manually but if you restart the container you lose the configuration:
docker run -e TZ=America/New_York ubuntu date
After some research, it appears that
CEST is not a valid value for
TZ environment variable.
CEST is just a displayable version of
CET when the current date is summer.
In fact, if I set
TZ to an obviously invalid value, it gives :
$ TZ=FOO date
Fri Apr 17 14:07:56 FOO 2020
Also note that it has nothing to do with Docker.