java time 시간 사용하기

// LocalDateTime 현재 날짜 가져오기
LocalDateTime currentLocalDateTime = LocalDateTime.now();


// LocalDateTime to Timestamp
long currentTimeMills = Timestamp.valueOf(currentLocalDateTime).getTime();


// Timestamp to LocalDateTime
long systemTimeMills = System.currentTimeMillis();
LocalDateTime systemLocalDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(systemTimeMills), TimeZone.getDefault().toZoneId());


// String Date to LocalDateTime
String strDate = "2020-10-26 14:28:00";
LocalDateTime localDateTime = LocalDateTime.parse(strDate, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));