<dependency> <groupId>net.time4j</groupId> <artifactId>time4j-core</artifactId> <version>3.39</version> </dependency> PlainTimestamp now = SystemClock.inZonalView(Asia/Shanghai).now().toClass(); PlainDate newDate = now.plus(CalendarDays.of(7)); String formattedDate = newDate.format(ChronoFormatter.ofPattern("yyyy-MM-dd")); PlainTimestamp newYorkTime = now.with(ZoneId.of("America/New_York"));