Change default format for DateTime parsing in ASP.NET Core

Question

I get a Date in an ASP.NET Core Controller like this:

public class MyController:Controller{
    public IActionResult Test(DateTime date) {

    }
}

Answer 1

MVC has always used InvariantCulture for route data and query strings (parameters that go in the URL). The reason behind it is that URLs in localized application must be universal. Otherwise, one url can provide different data depending on the user locale.

You can replace the query and route ValueProviderFactories with your own that respect current culture (or use method="POST" in forms)

public class CustomValueProviderFactory : IValueProviderFactory
{
    public Task CreateValueProviderAsync(ValueProviderFactoryContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException(nameof(context));
        }

        var query = context.ActionContext.HttpContext.Request.Query;
        if (query != null && query.Count > 0)
        {
            var valueProvider = new QueryStringValueProvider(
                BindingSource.Query,
                query,
                CultureInfo.CurrentCulture);

            context.ValueProviders.Add(valueProvider);
        }

        return Task.CompletedTask;
    }
}

services.AddMvc(opts => {
    // 2 - Index QueryStringValueProviderFactory
    opts.ValueProviderFactories[2] = new CustomValueProviderFactory(); 
})

P.S. It is reasonable behavior, but I don't understand why documentation don't cover this very important thing.