NodaTime 

Noda Time is a date and time API acting as an alternative to the built-in DateTime/DateTimeOffset etc types in .NET.

Provides serialization support between Noda Time and Json.NET.

Provides serialization support between Noda Time and System.Text.Json

Provides extra types which may be useful when testing code which uses Noda Time, such as a fake programmable implementation of IClock and a time zone which has a fixed transition. These types are also used to... More information

Provides serialization support between Noda Time and Google.Protobuf