Support for timezones?

[larskruckow]

I can see that it runs with default UTC time.
This makes it difficult to time everything to specific local times (especially with daylight saving)
I suggest adding support for setting the timezone it runs under in the environment

[m90]

In case you are able to set the host system's time (or just want to align the container time and the host time) you can mount /etc/timezone and /etc/localtime (readonly is enough) into the container:

➜  ~ docker run --rm -it --entrypoint ash offen/docker-volume-backup:latest 
~ # date
Sat Oct 23 13:29:31 UTC 2021
➜  ~ docker run --rm -it --entrypoint ash -v /etc/timezone:/etc/timzeone:ro -v /etc/localtime:/etc/localtime:ro offen/docker-volume-backup:latest
~ # date
Sat Oct 23 15:29:31 CEST 2021

Does this solve your usecase?

---

In case the image should support setting an arbitrary timezone through a TZ environment variable, it would need to install the tzdata package, which weighs in at 3.3MB and would add ~20% on top of the current image size, so I would like to avoid this in case it's possible.

[larskruckow]

Thanks.
Don't know why I didn't think of that.
I totally see your point with the increased size.
I can confirm that using the host time cron then runs at expected time as is on the host.

[m90]

I added a section on this to the README. Thanks for raising this.