TimeStampSurrogateSerializer.kt

object TimeStampSurrogateSerializer : KSerializer<Timestamp> {
    override val descriptor: SerialDescriptor = TimestampSurrogate.serializer().descriptor
    override fun serialize(encoder: Encoder, value: Timestamp) {
        val surrogate = TimestampSurrogate(value.date.getAsTime())
        encoder.encodeSerializableValue(TimestampSurrogate.serializer(), surrogate)
    }

    override fun deserialize(decoder: Decoder): Timestamp {
        val surrogate = decoder.decodeSerializableValue(TimestampSurrogate.serializer())
        return Timestamp(Date(surrogate.timeInMillis))
    }
}