Fix LocaleShortFormat to show date/time as per current locale

[Jojo-Schmitz]

Prerequisite to resolve musescore/MuseScore#15437

Without this using muse::DateFormat::LocaleShortFormat results in the "C" locale (AKA "en_US") to be used, with the very confusing MM/DD/YYYY format, that in turn prevents MuseScore to use anything sensible but the muse::DateFormat::ISODate format YYYY-MM-DD in headerfooterlayout.cpp

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 55b2a7c and e7cb62e.

📒 Files selected for processing (2)

• framework/languages/internal/languagesservice.cpp
• framework/rcontrol/mcp/mcpcontroller.cpp

📝 Walkthrough

Walkthrough

The pull request modifies LanguagesService::setCurrentLanguage to call std::setlocale(LC_TIME, ...) with the selected language code. This updates the process-wide C locale for time-related string formatting operations whenever the application language is switched. The change is a single-line addition that applies the language code to the LC_TIME locale category.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description clearly explains the issue and links to the prerequisite issue, but doesn't follow the repository template structure with required checklist items.	Add the required checklist items from the template (CLA signature, code guidelines compliance, testing verification, etc.) to meet repository standards.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing LocaleShortFormat to respect the current locale instead of defaulting to the C locale.
Linked Issues check	✅ Passed	The change successfully addresses the core requirement from issue #15437 by calling std::setlocale(LC_TIME, ...) to set the C locale to match the selected language, enabling LocaleShortFormat to use locale-appropriate formatting.
Out of Scope Changes check	✅ Passed	The modification is minimal and focused: only one line changed in LanguagesService::setCurrentLanguage to set LC_TIME locale, directly addressing the linked issue without introducing unrelated changes.

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[Jojo-Schmitz]

At least with Windows (11) this is the case, not sure about macOS and Linux?

[ajuncosa]

This looks good to me as an easy fix, thanks! I would perhaps move the line to LanguagesService::setCurrentLanguage(), though, anywhere below line 213. This is to set it just once instead of every time the configuration getter is called. Then, it would be like:

std::setlocale(LC_TIME, locale.name().toStdString().c_str());

(And you may or may not need to #include <clocale> so that the LC_TIME macro will be found.)

In the future we may want to actually wrap and use a Qt implementation as suggested in musescore/MuseScore#15437 (comment), as that would probably be the cleaner solution.

PS: once this is merged, I can update the other half of the musescore/MuseScore#15437 fix in the MuseScore repo, as it's WIP already

[Jojo-Schmitz]

Like this?

[coderabbitai]

Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@framework/languages/internal/languagesservice.cpp`:
- Line 214: The use of std::setlocale and LC_TIME in the languages service
requires the C locale header; add the missing include for <clocale> near the
other includes so the identifiers std::setlocale and LC_TIME are defined and the
file compiles (update the includes section where other headers are declared).
- Line 214: Capture and check the return value of std::setlocale when calling
std::setlocale(LC_TIME, lang.code.toStdString().c_str()); and if it returns
nullptr, emit a warning including the requested locale string (lang.code) and
the fact that setlocale failed; use the project's logging facility (e.g.,
qWarning() or the existing logger used elsewhere in languagesservice.cpp) so
failures to set LC_TIME are visible for debugging.
- Line 214: The call to std::setlocale(LC_TIME, lang.code.toStdString().c_str())
can fail silently and uses non‑canonical Qt locale strings; change it to use the
Qt canonical name (locale.name()) and check the return value of std::setlocale.
If std::setlocale returns nullptr, log an error via the existing logging
facility (same context where std::setlocale is called) and avoid assuming
LC_TIME was changed; otherwise proceed. Update the call sites that reference
lang.code, replace with locale.name(), perform the nullptr check, and emit a
clear log message on failure.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 5e1045b and 55b2a7c.

📒 Files selected for processing (1)

• framework/languages/internal/languagesservice.cpp

[Jojo-Schmitz]

See also musescore/MuseScore#33780