iOS CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern not getting OS settings

[Saurbaum]

Description

I'm trying to display a datetime using the users local settings. in iOS this is always returning a middle endian format

for example
Console.WriteLine(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern);
prints out
M/d/yyyy

Reproduction Steps

Create a MAUI app that targets iOS

trigger
Console.WriteLine(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern);

Expected behavior

The returned format should match the devices configuration and not default to US English

Actual behavior

M/d/yyyy

Looking at the LCID it's also reporting as 9

This applies to both CurrentCulture and CurrentUICulture

Regression?

No response

Known Workarounds

No response

Configuration

.Net 9
iOS 18.2
ARM64
Also an issue on older iOS platforms

It does work as expected on Android and Windows

Other information

No response

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[tarekgh]

@matouskozak please triage. Thanks!

[matouskozak]

@Saurbaum This might be related to the issue fixed in #111032. Could you please provide, what value is set in CultureInfo.CurrentCulture and what value is expected based on the device settings?

[Saurbaum]

@matouskozak I am getting the same "en" instead of en-US or en-GB which are the two I've tried with.

[matouskozak]

@matouskozak I am getting the same "en" instead of en-US or en-GB which are the two I've tried with.

Have you tried setting the culture manually to en-US or en-GB to see if it resolves the problem with ShortDatePattern? If that is the case, then the fix will be part of .NET 9 servicing.

[Saurbaum]

Yes if I call
CultureInfo.CurrentCulture = new CultureInfo("en-GB");
the iOS target will get the correct format.

Any idea when that's next .net9 update is due?