kotlinx.serialization VS kotlinx-datetime

Have you tried this:? https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md

Regardless, I followed the documentation to register List for polymorphic serialization and my static code analysis does not seem to be happy with it.

I think kotlinx.serialization might come close, but looks like custom Encoders and Decoders are still experimental.

This example will not work on a multiplatform project. you are using gson, gson runs only on jvm, you should use https://github.com/Kotlin/kotlinx.serialization for the json parsing

This is the issue to +1 https://github.com/Kotlin/kotlinx.serialization/issues/1931

Fun fact, kotlinx.serialization had a release just recently which makes it come with some bundled proguard rules to make this experience easier. Yes you'll still have issues if you're using things via reflection and try to serialize things that proguard deemed unused and removed them, but it's a step forward https://github.com/Kotlin/kotlinx.serialization/releases/tag/v1.5.0-RC

Kotlin Serialization

Kotlin Serialization is also a newer option, but doesn't have as much traction.

``` see the docs

Kotlin multiplatform types often come with their own serializers. https://github.com/Kotlin/kotlinx-datetime and https://github.com/hfhbd/kotlinx-uuid do, for example.

But we do have such plans for our kotlinx-datetime library and expect to provide at least a partial solution during the course of the year

It depends, time has a complex and native bound legacy. But I bet you want this https://github.com/Kotlin/kotlinx-datetime and DateTimePeriod.