strftime() ignores in-session $TZ value

[ZyX-I]

Consider the following script:

let $TZ='UTC'
echo strftime('%H', 0)

. In Vim this will yield 00. In NeoVim this yields 03 (TZ is unset when session starts, system timezone is Europe/Moscow). It would actually be better to have third (timezone) argument to strftime(), but current variant is not compatible in any case.

[tarruda]

I have taken a quick look at f_strftime and couldn't find why nvim has this behavior, but it has something to do with how it sets environment variables because strftime(3) clearly states that it uses the $TZ environment variable and both vim and nvim call that function. Closing in favor of #3265.

[ZyX-I]

@tarruda I do not see how is #3265 related?

[justinmk]

Can't reproduce this on macos but maybe $TZ is not respected there (not mentioned in Man strftime(3)).

Can someone check this on linux?

[zeertzjq]

Cannot reproduce on Linux either.