LocalDateTime <--> Epoc mili second

Java

メモ、

long milliseconds = System.currentTimeMillis();

LocalDateTime time
 = Instant.ofEpochMilli(milliseconds).atZone(ZoneId.systemDefault()).toLocalDateTime();
LocalDateTime localdatetime = LocalDateTime.of(2018, 02, 28, 22, 32, 17);

long lt
 = localdatetime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();