date picker using 'ar-SA' locale, displayed dates not correct, while value is ok.

[DevAliMaher]

Is this a regression?

• [X] Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

17

Description

I used to use Date Picker with Hijri dates, using native adabter and every thing works fine, after updating to angular 18.1 I got this issue:

• in main.ts => regist SA locale

import LocaleSA from '@angular/common/locales/ar-SA';
registerLocaleData(LocaleSA, LanguageEnum.AR);

• in app.config.ts => provide native adapter

    provideNativeDateAdapter(),
    { provide: MAT_DATE_LOCALE, useValue: 'ar-SA' },

Reproduction

StackBlitz link: Steps to reproduce:

Expected Behavior

I expect to see the correct Hijri date in this case Muharram / محرم first month of Hijri year not Shawal / شوال, and day is 22 not 30

Actual Behavior

the calendar point at 30/Shawal not 22/Muharram, 30/شوال not 22/محرم

Environment

• Angular:
• CDK/Material:
• Browser(s):
• Operating System (e.g. Windows, macOS, Ubuntu):

[amysorto]

Can you provide a Stackblitz of your example?

[DevAliMaher]

@amysorto https://stackblitz.com/edit/stackblitz-starters-gq9csg?file=src%2Fglobal_styles.scss