Timezone support in Zephyr Project

[mirzak]

Hi,

I have a use-case where I would like to manage timezone settings on the device depending on regional deployment. My intention was to use localtime() which is a common libc implementation to support timezone via the TZ environment variable. But this does not appear to be supported in Zephyr Project when I look in https://github.com/zephyrproject-rtos/zephyr/tree/main/lib/libc/common/source/time. It appears to only support UTC time.

This implementation seems to be shared between Picolibc (this is what I am using) and Newlib. As I understand both Picolibc and Newlib do support timezones but Zephyr Project has decided to override this (in favor of portability?)?

I am not sure what my options would be, besides doing a major rewrite of the common libc. Maybe I am missing something obvious? I can not imagine that this use-case is that exotic but I could not find much discussions on this topic in Discussions and Issues.

Appreciate your feedback.

Best Regards
Mirza