Begin of the insertion# Situation

End of the insertion ### Begin of the insertion**Environment**End of the insertion Begin of the deletion **Environment**:End of the deletion

Begin of the insertionTeam is bilingual. Some team members use the English version, some use the German one.End of the insertion Begin of the deletion Your OpenProject Version: 12.1.6End of the deletion

Begin of the deletion Operating System / Browser / OpenProject language:

End of the deletion ### **Steps to Begin of the insertionreproduce**End of the insertion Begin of the deletion reproduce:**End of the deletion

1. set "First week in year contains" to "Thursday" (German Begin of the insertionsetting in the admin pages) - default is "based on user language"End of the insertion Begin of the deletion version)End of the deletion
2. set User's interface language to English
3. enable Gantt (calendar weeks visible)

### **Actual Behavior**

Begin of the insertionCalendar weeks are are non-iso week.End of the insertion Begin of the deletion Current week is not German one.End of the deletion

### **Expected Behavior**

Respected settings "First week in year contains".

It's a really confusing when people of the same team communicate using the wrong calendar week. Begin of the insertion

# Affected code parts

```bash
spec/features/work_packages/timeline/timeline_dates_spec.rb
- behavior is expected but can lead to issues
- especially when people switch between languages (to make screenshots, etc.)
frontend/src/app/features/work-packages/components/wp-table/timeline/header/wp-timeline-header.directive.ts
- "replace all 'ww' with 'WW' depending on the system-wide setting
```End of the insertion