oven-sh/bun

Default locale for`Intl.DateTimeFormat` should match `$LANG` environment variable

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#8,480 opened on Jan 25, 2024

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 (7 comments) (9 reactions) (1 assignee)Rust (4,486 forks)batch import
bugconfirmed buggood first issue

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Description

What version of Bun is running?

1.0.25+a8ff7be64

What platform is your computer?

Darwin 23.3.0 arm64 arm

What steps can reproduce the bug?

> bun repl
> Intl.DateTimeFormat().resolvedOptions().locale
'en-US'

What is the expected behavior?

In node, deno and browsers, it is always the user's language preference. In my case it's zh-CN, which corresponds to the value obtained by running echo $LANG in the terminal.

What do you see instead?

Always en-US

Additional information

No response

Contributor guide

Research direction
Investigate how Intl.DateTimeFormat resolves its default locale in Bun, and compare with Node.js/Deno's handling of the $LANG environment variable. Look at the ICU4C or system locale initialization code.
Tech stack
javascriptrust
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScriptRust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65