Tests fail in azure devops pipeline due to different culture setting C#

[lindonnet]

We have a pipeline which builds, tests and outputs some artefacts to nuget. After an initial push of the existing codebase (C#), the tests fail in the pipeline where .ToString() is called on a DateTime object, it returns mm/dd/yyyy rather than the UK format dd/mm/yyyy as per our local developer machines where the tests pass OK. I can think of 4 ways to overcome this but what is best practice and how has anyone else overcome this?

• Set CultureInfo.DefaultThreadCurrentCulture at various points in the code
• Set default culture in yaml or pipeline settings?
• Set default culture in app.config of the unit tests profile
• Change everyone ToString() to ToString("dd/mm/yyyy") (far from ideal!

[rproffitt]

Without detailing what it does, my nod is to https://docs.microsoft.com/en-us/dotnet/api/system.globalization.cultureinfo.defaultthreadcurrentculture and its example.

Given it affects the current and new threads, this line of code should appear too often.

Also note CurrentUICulture as it may be a good idea to implement or at least know about it.