[SOLVED] java.util.Date to kotlinx.datetime.LocalDateTime

java.util.Date to kotlinx.datetime.LocalDateTime

I have a value of type java.util.Date which was obtained from a legacy third-party API. Is there a direct way of converting it to kotlinx.datetime.LocalDateTime? I know how to do it only in a roundabout way, such as serializing to String and deserializing, or by converting to java.time.LocalDateTime first and then to the wanted type.

Solution

I think the most efficient conversion would be with Instant.fromEpochMilliseconds

Here's an example extension. You can do something similar for other types that you may need

import java.util.Date
import kotlinx.datetime.FixedOffsetTimeZone
import kotlinx.datetime.Instant
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.UtcOffset
import kotlinx.datetime.toLocalDateTime

fun Date.toLocalDateTime(): LocalDateTime =
  Instant.fromEpochMilliseconds(this.time).toLocalDateTime(
    FixedOffsetTimeZone(
      UtcOffset.ZERO
    )
  )