private static LocalDate parse(final DateTimeFormatter formatter, final String value) {
try {
Instant epoch = Instant.ofEpochMilli(Long.parseLong(value));
ZonedDateTime zonedDate =
epoch.atZone(Optional.ofNullable(formatter.getZone()).orElse(ZoneId.systemDefault()));
return zonedDate.toLocalDate();
} catch (NumberFormatException ex) {
return LocalDate.parse(value, formatter);
}
}
/**
* Check time zones on the IANA time and zone database
*
* @param args
*/
public static void main(String[] args) {
ZoneId casaZone = ZoneId.of("Africa/Casablanca");
ZoneId defaultZone = TimeZone.getDefault().toZoneId();
LocalDate rightNow = LocalDate.now();
ZonedDateTime zoneDateTime = rightNow.atStartOfDay(casaZone);
ZoneId parisZone = ZoneId.of("Europe/Paris");
LocalDateTime rightNowInTime = LocalDateTime.now();
ZonedDateTime rightNowInTimeInParis = rightNowInTime.atZone(parisZone);
Instant thisMoment = Instant.now();
ZonedDateTime thisMomentInCasa = thisMoment.atZone(casaZone);
ZoneId tokyoZone = ZoneId.of("Asia/Tokyo");
LocalDate thisInstantInTokyo = rightNowInTime.toLocalDate();
LocalDateTime timeFromThisMomentInTokyo = LocalDateTime.ofInstant(thisMoment, tokyoZone);
System.out.println(
String.format("In Tokyo right now is %s", timeFromThisMomentInTokyo.toString()));
}
public static void main(String[] args) {
ZonedDateTime apollo11launch =
ZonedDateTime.of(1969, 7, 16, 9, 32, 0, 0, ZoneId.of("America/New_York"));
// 1969-07-16T09:32-04:00[America/New_York]
System.out.println("apollo11launch: " + apollo11launch);
Instant instant = apollo11launch.toInstant();
System.out.println("instant: " + instant);
ZonedDateTime zonedDateTime = instant.atZone(ZoneId.of("UTC"));
System.out.println("zonedDateTime: " + zonedDateTime);
ZonedDateTime skipped =
ZonedDateTime.of(
LocalDate.of(2013, 3, 31), LocalTime.of(2, 30), ZoneId.of("Europe/Berlin"));
// Constructs March 31 3:30
System.out.println("skipped: " + skipped);
ZonedDateTime ambiguous =
ZonedDateTime.of(
LocalDate.of(2013, 10, 27), // End of daylight savings time
LocalTime.of(2, 30),
ZoneId.of("Europe/Berlin"));
// 2013-10-27T02:30+02:00[Europe/Berlin]
ZonedDateTime anHourLater = ambiguous.plusHours(1);
// 2013-10-27T02:30+01:00[Europe/Berlin]
System.out.println("ambiguous: " + ambiguous);
System.out.println("anHourLater: " + anHourLater);
ZonedDateTime meeting =
ZonedDateTime.of(
LocalDate.of(2013, 10, 31), LocalTime.of(14, 30), ZoneId.of("America/Los_Angeles"));
System.out.println("meeting: " + meeting);
ZonedDateTime nextMeeting = meeting.plus(Duration.ofDays(7));
// Caution! Won’t work with daylight savings time
System.out.println("nextMeeting: " + nextMeeting);
nextMeeting = meeting.plus(Period.ofDays(7)); // OK
System.out.println("nextMeeting: " + nextMeeting);
}
@Override
LocalDate convert(Instant birthday) {
return birthday.atZone(ZoneId.systemDefault()).toLocalDate();
}