Using the DateTimeSerializer the tick count differs when deserializing a DateTime object:

DateTimeSerializer.LocalInstance.Serialize(context, args, aDateTime);
var decodedDateTime = DateTimeSerializer.LocalInstance.Deserialize(context, args);

The deserialized DateTime object is equal to the original except for the Tick count which differs by some nanoseconds (this is reproducable and it's always the last 4 digits of the tick count that differ). Here is one Xunit exception message:

Xunit.Sdk.EqualException: "Assert.Equal() Failure
Expected: 2020-03-06T09:54:09.6356673+01:00
Actual:     2020-03-06T09:54:09.6350000+01:00