TimePicker Displays AM/PM Text in Different Languages with hh:mm tt Format on .NET 9 SDK (iOS Only)

[NiravTyler]

Description

Here’s the reformatted version:
Issue Description: AM/PM Text in TimePicker Control on iOS

When using the hh:mm tt format for the TimePicker control in a .NET MAUI application, the AM/PM text appears randomly in different languages after selecting a value from the picker.

Affected Platform: iOS
SDK Versions:
    .NET 8 SDK: Working as expected
    .NET 9 SDK: AM/PM text issue present

Reference Videos

.NET 8 SDK (Working Fine):

Time.picker.with.NET.8.SDK.working.fine.mp4

.NET 9 SDK (AM/PM Text Issue):

https://drive.google.com/file/d/1ow8Y4VGr_2sHRwEr8NzkloaC5CboLkI_/view?usp=sharing

Steps to Reproduce

Steps to Reproduce the Issue with the .NET MAUI TimePicker Control

Clone the MAUI Samples Repository:
Download the maui-samples repository using the following link:
https://github.com/dotnet/maui-samples.git

Open the ControlGallery Solution:
Navigate to the following path in the cloned repository:
9.0/UserInterface/ControlGallery
Open the ControlGallery solution in your preferred IDE (e.g., Visual Studio).

Locate the TimePicker Demo File:
Open the TimePickerDemoPage.xaml file located at:
[ControlGallery/Views/XAML/TimePickerDemoPage.xaml](https://github.com/dotnet/maui-samples/blob/main/9.0/UserInterface/ControlGallery/ControlGallery/Views/XAML/TimePickerDemoPage.xaml)

Modify the TimePicker Control:
Add the following code snippet to the TimePicker control in TimePickerDemoPage.xaml:

<TimePicker
    x:Name="TimePickerControl"
    Format="hh:mm tt"
    VerticalOptions="CenterAndExpand"
    Margin="10, 0" />

Run the Application in iOS Simulator:
Build and run the project using the iOS simulator.
Observe the issue related to the AM/PM text display as shown in the video linked below.

Issue Details

SDK Version: .NET 9
Description: The TimePicker control has an issue with the display of AM/PM text in the iOS simulator.
Reference Video:
AM/PM Display Issue

Time picker with .NET 9 SDK (having an issue with AM/PM text) video link:
https://drive.google.com/file/d/1ow8Y4VGr_2sHRwEr8NzkloaC5CboLkI_/view?usp=sharing

Link to public reproduction project repository

https://github.com/dotnet/maui-samples/tree/main/9.0

Version with bug

9.0.0 GA

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.100 SR10

Affected platforms

iOS

Affected platform versions

iOS 17, 18

Did you find any workaround?

No, I did not found any solution yet.

I tried to set TimeFormat = CultureInfo.CurrentCulture.DateTimeFormat.ShortTimePattern for Timepicket format and also set CultureInfo to (en-US) for the sample app but still not working.

Relevant log output

[jfversluis]

Probably related to/duplicate of dotnet/runtime#110680

[SimonePit]

Hi,
Any news or workarounds about this bug?