First, the output ("2025-06-22 10:02:48", "2025-06-22 10:02:48")
of serialized DatePair
is not a standard JSON, that mean's you can not using SerializerProvider.defaultSerializeValue
. You need create a format with JsonFormat
or define a default, and the Serializer
(recommended extends StdSerializer
) should implements ContextualSerializer
. You can refer to the implementation of DateSerializer
and DateTimeSerializerBase
.