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World Clock

Print the current time in all time zones known to the JDK (from the tz database) together with their current UTC offset and the DST status.

Since Java 8

import java.time.Instant; import java.time.ZoneId; import java.time.ZonedDateTime; import java.time.format.DateTimeFormatter; import java.util.Locale; public class WorldClock { static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("E, YYYY-MM-dd HH:mm:ss xxx", Locale.US); private static void print(ZonedDateTime t) { String dst = t.getZone().getRules().isDaylightSavings(t.toInstant()) ? "DST" : ""; System.out.printf("%-32s %s %s\n", t.getZone(), t.format(FORMATTER), dst); } public static void main(String... args) { Instant now = Instant.now(); ZoneId.getAvailableZoneIds().stream() // .map(ZoneId::of) // .map((ZoneId z) -> ZonedDateTime.ofInstant(now, z)) // .sorted() // .forEach(WorldClock::print); } }

This snippet at GitHub