import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
 
class Main {
    public static void main(String[] args) {
        System.out.println(ZonedDateTime.ofInstant(Instant.ofEpochMilli(1437404400000L), ZoneId.of("Europe/London"))
                .with(LocalTime.parse("21:00", DateTimeFormatter.ofPattern("HH:mm", Locale.ENGLISH))));
    }
}

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