Unintended localization for DateTime strings

[danzhu54]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

We're seeing unintentional localization occuring on the marketing site. On the Blazor project, we do not have localization enabled.

The code that is causing this issue is here:
show.LocalScheduledStartTime?.ToString("hh:mmtt")

It appears that converting a DateTime to a string is automatically also taking browser locale into consideration even though we do not have it enabled in our Program.cs file

Expected Behavior

The DateTime toString method should not automatically convert DateTimes to the browser locale when localization is not enabled on the project.

Steps To Reproduce

Repo steps:

1. Set default browser language to Japanese
2. Navigate to https://dotnet.microsoft.com/live
3. Scroll to the bottom of the page and select English (United States) in the footer dropdown
4. Observe the page is still displaying the dates and times in Japanese

Exceptions (if any)

No response

.NET Version

8.0

Anything else?

No response

[javiercn]

@danzhu54 thanks for contacting us.

I think that if you have a different locale you need to set up that locale when the webassembly process starts in Program.cs on Thread.CurrentCulture and Thread.CurrentUICulture to whatever language you want to use.

[danzhu54]

Thanks @javiercn that resolved the issue for us. However, I feel like it's not intutive to require setting this value by default. This behavior creates an inconsistent experience for a user visiting for example an english only site by having a mixture of english text and DateTime elements rendered into their browser locale.

[javiercn]

@danzhu54 thanks for the additional details.

We have an item on the backlog to flow the culture from the server to webassembly and use that.

#26941

Closing this as a dupe of it.