It is absolutely possible to do this, and to generate client code which complies with ISO-8601 in JS/TS. Large amounts of financial services would not work if this was not the case.

See the c# support for ISO-8601 strings: https://learn.microsoft.com/en-us/dotnet/standard/base-types...

`DateTime` is not an ISO-8601 type. It can _parse_ an ISO-8601 formatted string.

And even past that, there are Windows-specific idiosyncrasies with how the `DateTime` class implements the parsing of these strings and how it stores the resulting value.

This is exactly the point: a string is just a data interchange format in the context of a DateTime, and C# provides (as far as I can tell) a complete way of accessing the ISO-8601 specification on the language object. It also supports type-safe generation of clients and client object (or struct) generation from the ISO-8601 string format.

> And even past that, there are Windows-specific idiosyncrasies with how the `DateTime` class implements the parsing of these strings and how it stores the resulting value.

Not really. The windows statements on the article (and I use this on linux for financial services software) are related to automated settings of the preferences for generated strings. All of these may be set within the code itself.

That was based on decades of experience in .NET and Windows. Not the article ;).

Related but distinct from serialization.

https://www.w3.org/TR/xmlschema-2/#isoformats

And so you can write a web service in Java and use it from C#, or whatever.