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Official Kotlin/Java SDK for Jellyfin. org.jellyfin.sdk:jellyfin-model-jvm

There is a newer version: 1.6.4

package org.jellyfin.sdk.model.serializer

import kotlinx.serialization.KSerializer
import kotlinx.serialization.descriptors.PrimitiveKind
import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import org.jellyfin.sdk.model.DateTime
import java.time.ZoneId
import java.time.ZonedDateTime
import java.time.format.DateTimeFormatter
import java.time.format.DateTimeParseException

public actual class DateTimeSerializer(
	private val zoneId: ZoneId = ZoneId.systemDefault(),
) : KSerializer {
	actual override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("org.jellyfin.LocalDateTime", PrimitiveKind.STRING)

	actual override fun deserialize(decoder: Decoder): DateTime = try {
		ZonedDateTime.parse(decoder.decodeString()).withZoneSameInstant(zoneId).toLocalDateTime()
	} catch (err: DateTimeParseException) {
		// Server will sometimes return 0001-01-01T00:00:00
		// but java.time can't parse that
		DateTime.MIN
	}

	actual override fun serialize(encoder: Encoder, value: DateTime): Unit =
		encoder.encodeString(value.atZone(zoneId).format(DateTimeFormatter.ISO_OFFSET_DATE_TIME))
}