Serializers for java.time.*

[aSemy]

Kotlin/kotlinx.serialization#1806

What is your use-case and why do you need this feature?

We use a lot of java.time.OffsetDateTime which it is a bit cumbersome to have to annotate separately with a custom serializer like @Serializable(KOffsetDateTimeSerializer::class).

Describe the solution you'd like

It would be useful to have a special org.jetbrains.kotlinx:kotlinx-serialization-jvmtime dependency which automatically adds serializers to handle some very common classes from the java8 java.time module.

[Kantis]

I think it makes sense to start out with:

• Duration
• Instant
• LocalDate
• LocalDateTime
• LocalTime
• OffsetDateTime
• Year
• YearMonth
• ZonedDateTime
• ZoneId
• ZoneOffset
• DayOfWeek
• Month

This means excluding these types for now:

• Period
• OffsetTime
• MonthDay
• Clock

Based on the assumption that these are less commonly used, especially in serial forms.

I think it's top priority to get support for:

• Instant
• LocalDate
• LocalDateTime
• YearMonth
• OffsetDateTime