1 files changed, 20 insertions, 6 deletions
diff --git a/guide/example/example-serializer-18.kt b/guide/example/example-serializer-18.kt
index 91626316..9987e822 100644
--- a/guide/example/example-serializer-18.kt
+++ b/guide/example/example-serializer-18.kt
@@ -8,15 +8,29 @@ import kotlinx.serialization.descriptors.*
 
 import java.util.Date
 import java.text.SimpleDateFormat
+  
+object DateAsLongSerializer : KSerializer<Date> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("DateAsLong", PrimitiveKind.LONG)
+    override fun serialize(encoder: Encoder, value: Date) = encoder.encodeLong(value.time)
+    override fun deserialize(decoder: Decoder): Date = Date(decoder.decodeLong())
+}
+
+object DateAsSimpleTextSerializer: KSerializer<Date> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("DateAsSimpleText", PrimitiveKind.LONG)
+    private val format = SimpleDateFormat("yyyy-MM-dd")
+    override fun serialize(encoder: Encoder, value: Date) = encoder.encodeString(format.format(value))
+    override fun deserialize(decoder: Decoder): Date = format.parse(decoder.decodeString())
+}
+
+typealias DateAsLong = @Serializable(DateAsLongSerializer::class) Date
+
+typealias DateAsText = @Serializable(DateAsSimpleTextSerializer::class) Date
 
 @Serializable          
-class ProgrammingLanguage(
-    val name: String,
-    @Contextual 
-    val stableReleaseDate: Date
-)
+class ProgrammingLanguage(val stableReleaseDate: DateAsText, val lastReleaseTimestamp: DateAsLong)
 
 fun main() {
-    val data = ProgrammingLanguage("Kotlin", SimpleDateFormat("yyyy-MM-ddX").parse("2016-02-15+00"))
+    val format = SimpleDateFormat("yyyy-MM-ddX")
+    val data = ProgrammingLanguage(format.parse("2016-02-15+00"), format.parse("2022-07-07+00"))
     println(Json.encodeToString(data))
 }