If I understand correctly, `kotlin.time.Instant` and `kotlin.time.Clock` were introduced in Kotlin 2...

# kotlinx-datetime

[curioustechizen]

If I understand correctly, kotlin.time.Instant and kotlin.time.Clock were introduced in Kotlin 2.1.20
Then, kotlinx.serialization added support for these 2 types in v1.9.0, but that requires Kotlin 2.2

What are my options if I want to stay on Kotlin 2.1.20 and want to serialize kotlin.time.Instant types? Is the compat artifact useful for this situation?

[jw]

It's single-digit LOC to write a custom serializer for instant.

[jw]

You're basically just calling toEpochMilliseconds to fromEpochMilliseconds and you're done.

[curioustechizen]

IIRC kotlinx.datetime had 2 separate serializers (one would use the ISO format and the other I think would save epoch seconds and nanoseconds components).

I need to be able to deserialize data that has already been stored (using the now-removed serializers from kotlinx.datetime). I can probably look into my persisted data to figure out which one of those is being used and then implement that in my app.

[hfhbd]

The generated serializer uses the iso format. So to keep the same behavior with 2.2.0 you only need the iso serializer, that is incredible easy.

[Nikky]

object InstantSerializer : FormattedInstantSerializer(
    "ISO", DateTimeComponents.Formats.ISO_DATE_TIME_OFFSET
)

or such iirc