What method transforms a user's birth time from one zone to another, e.g., from "America/Chicago" to "Asia/Tokyo"?
ZoneId.convert("America/Chicago", "Asia/Tokyo")
LocalDateTime.now().zoneShift("Asia/Tokyo")
TimeZone.changeZone("America/Chicago", "Asia/Tokyo")
ZonedDateTime.of(userBirthDateTime, ZoneId.of("America/Chicago")).withZoneSameInstant(ZoneId.of("Asia/Tokyo"))