时区和ZonedDateTime

ZoneId

 ZoneId zone = ZoneId.of("Asia/Shanghai");
ZoneId.systemDefault();
Set zones = ZoneId.getAvailableZoneIds(); 

ZonedDateTime

 ZonedDateTime zdt = ZonedDateTime.now();
ZonedDateTime zdt2 = ZonedDateTime.of(2026, 6, 15, 10, 30, 0, 0, zone);

ZonedDateTime converted = zdt.withZoneSameInstant(ZoneId.of("America/New_York")); 

Instant

 Instant instant = Instant.now();
instant.atZone(zone);

long epochSecond = instant.getEpochSecond();
Instant fromEpoch = Instant.ofEpochSecond(epochSecond); 

小结