lib: support setting process.env.TZ on windows #38642

jasnell · 2021-05-11T23:58:34Z

Fixes: #4230
Signed-off-by: James M Snell jasnell@gmail.com

Update: Even tho this is semver-patch, I'm marking it as a notable change for when it lands. The bug was first reported back in Dec 2015, it was closed for a while, one partial attempt at fixing it was made a couple of years ago, and this completes the fix.

/cc @targos @srl295

src/node_env_var.cc

test/parallel/test-datetime-change-notify.js

srl295 · 2021-05-12T00:43:04Z

Might just have NODE_DEFAULT_ZONE instead of trying to emulate TZ. don't use abbrevs just tz IDs like America/Los_Angeles.

jasnell · 2021-05-12T02:25:08Z

@srl295:

Might just have NODE_DEFAULT_ZONE instead of trying to emulate TZ.

In the current version of the PR, use of set TZ="..." does work. Is there a particular limitation here that would make it undesirable? What would using NODE_DEFAULT_ZONE give us? My concern would be introducing something that is inconsistent with TZ on non-windows systems.

srl295 · 2021-05-12T02:27:41Z

@srl295:

Might just have NODE_DEFAULT_ZONE instead of trying to emulate TZ.

In the current version of the PR, use of set TZ="..." does work. Is there a particular limitation here that would make it undesirable? What would using NODE_DEFAULT_ZONE give us? My concern would be introducing something that is inconsistent with TZ on non-windows systems.

What matt was alluding to is that it's already inconsistent. Posix does a bunch of other processing. Node-default-zone would make it clear we are simply choosing a new default zone by the full id rather than trying To emulate Posix TZ on windows.

srl295

I'll say lgtm with caveats that it will not be === TZ behavior on posix, suggestions as noted in thread.

jasnell · 2021-05-12T19:01:44Z

I'll say lgtm with caveats that it will not be === TZ behavior on posix, suggestions as noted in thread.

Understood. I think those differences will be ok here. I'll try to find a good place to describe those differences in the docs

srl295 · 2021-05-12T19:19:38Z

I'll say lgtm with caveats that it will not be === TZ behavior on posix, suggestions as noted in thread.

Understood. I think those differences will be ok here. I'll try to find a good place to describe those differences in the docs

one reference: https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
ICU won't necessarily handle those completely either, but it will try to find a matching zone.
Perhaps something like this:

While the TZ env variable on Node.js won't handle all of the various ways that the TZ variable is handled in other environments, it will support tz ids (such as Etc/UTC, Europe/Paris or America/New_York. It may support a few other abbreviations or aliases, but these are strongly discouraged.

sorry not sorry for being a stick in the timezone mud :)

srl295

🇮🇪

src/node_i18n.cc

mcollina

lgtm

doc/api/cli.md

Fixes: nodejs#4230 Signed-off-by: James M Snell <jasnell@gmail.com>

nodejs-github-bot · 2021-05-14T23:07:20Z

CI: https://ci.nodejs.org/job/node-test-pull-request/38099/ 💚

jasnell · 2021-05-17T19:03:13Z

Landed in 16cb4f7

Fixes: #4230 Signed-off-by: James M Snell <jasnell@gmail.com> PR-URL: #38642 Reviewed-By: Steven R Loomis <srloomis@us.ibm.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Notable changes: async_hooks: * (SEMVER-MINOR) use new v8::Context PromiseHook API (Stephen Belanger) #36394 lib: * support setting process.env.TZ on windows (James M Snell) #38642 module: * (SEMVER-MINOR) add support for `URL` to `import.meta.resolve` (Antoine du Hamel) #38587 process: * (SEMVER-MINOR) add `'worker'` event (James M Snell) #38659 util: * (SEMVER-MINOR) add util.types.isKeyObject and util.types.isCryptoKey (Filip Skokan) #38619 PR-URL: #38719

nodejs/node#38642

github-actions bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels May 11, 2021

jasnell mentioned this pull request May 12, 2021

I can't set a default timezone on windows. #4230

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lib: support setting process.env.TZ on windows

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Fixes: nodejs#4230 Signed-off-by: James M Snell <jasnell@gmail.com>

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fixup! lib: support setting process.env.TZ on windows

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srl295 added the i18n-api Issues and PRs related to the i18n implementation. label May 14, 2021

jasnell closed this May 17, 2021

jasnell added the notable-change PRs with changes that should be highlighted in changelogs. label May 17, 2021

targos mentioned this pull request May 18, 2021

v16.2.0 release proposal #38719

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richardlau mentioned this pull request Jul 16, 2021

test: set locale for datetime-change-notify test #38741

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lib: support setting process.env.TZ on windows #38642

lib: support setting process.env.TZ on windows #38642

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