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Serializing DateOnly and TimeOnly types with System.Text.Json

.NET 6 introduced 2 new types to work with dates and times in .NET. One is the DateOnly type that represents the Date portion of a DateTime. The other is the TimeOnly type that represents the Time portion of a DateTime.

Unfortunately when you try to use these types inside your data contracts, you get into trouble when you try to Serialize them through the System.Text.Json.JsonSerializer.

To solve this problem, we can create 2 custom JsonConverter types:

To use these converters, we need to create and pass an instance of the JsonSerializerOptions where we register these 2 converters:

The generated JSON looks like this:

Hope that helps!

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