java time - Instant, LocalDate

@RequestParam(value = "date", required = false) @DateTimeFormat(pattern = "yyyyMMdd") LocalDate date) 동작

@RequestParam(value = "date", required = false) @DateTimeFormat(pattern = "yyyyMMdd") Instant date) 에러

Instant로는 yyyymmdd로 받을 수가 없는 듯

 

how to check available timezone

Set<String> zoneIdSet = ZoneId.getAvailableZoneIds();

for(String zoneId:zoneIdSet) System.out.println(zoneId);

 

하루 더하기

[LocalDate] date.plusDays(1)

[Instant] time.plus(1, ChronoUnit.DAYS), time.plus(Duration.ofDays(1))

 

LocalDate -> Instant 변환

ZoneId timezone = ZoneId.of("UTC");// ZoneId.systemDefault()->KST+9

date.atStartOfDay(timezone).toInstant();