ThreetenABPでUNIXタイムスタンプをLocalDateに変換する

val timestamp = 1634353200
val instant = Instant.ofEpochSecond(timestamp)
val zone = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault())
// 2021-10-16
zone.toLocalDate()
// 2021-10-16T12:00
zone.toLocalDateTime()
// 12:00
zone.toLocalTime()