Convert LocalDateTime to seconds since January 1, 1970, 00:00:00 GMT
val now = LocalDateTime.now(ZoneOffset.UTC)// LocalDateTime to epoch secondsval seconds = now.atZone(ZoneOffset.UTC).toEpochSecond())// Epoch seconds to LocalDateTimeval newNow = LocalDateTime.ofInstant(Instant.ofEpochSecond(seconds), ZoneOffset.UTC)Convert LocalDateTime to milliseconds since January 1, 1970, 00:00:00 GMT
// LocalDateTime to epoch millisecondsval milliseconds = now.atZone(ZoneOffset.UTC)?.toInstant()?.toEpochMilli()// epoch milliseconds to LocalDateTimeval newNow = LocalDateTime.ofInstant(Instant.ofEpochMilli(milliseconds), ZoneOffset.UTC)NOTE: Timestamp Epoch to LocalDateTime / Java8 Date Time.
Kotlin Extensions
fun LocalDateTime.toMillis(zone: ZoneId = ZoneId.systemDefault()) = atZone(zone)?.toInstant()?.toEpochMilli()val now = LocalDateTime.now()val millis = now.toMillis()