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Rule request: Fixed-format NSDateFormatter not using invariant (POSIX) locale

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rule-request
Dominant language
Swift
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Description

From http://fauxpasapp.com/rules/#rule-FixedFormatDateFormatter:

Warns when an NSDateFormatter is used with fixed-format dates without using the invariant en_US_POSIX locale. If any other locale is used, the date format string may be overwritten, depending on system date and time settings.

When working with user-visible dates, date and time styles should be used instead of setting a date format.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file or test is named. Start with the linked FixedFormatDateFormatter rule specification and inspect SwiftLint’s existing rule entry points and tests; done means detecting fixed-format NSDateFormatter uses without the invariant en_US_POSIX locale and covering the documented guidance for user-visible dates.

Written by the indexing model from the issue text.

Assessment

Tech stack
swift
Domain
tooling
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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