Examples of ZoneRules

java.time.zone.ZoneRules
The rules defining how the zone offset varies for a single time-zone.
The rules model all the historic and future transitions for a time-zone. {@link ZoneOffsetTransition} is used for known transitions, typically historic.{@link ZoneOffsetTransitionRule} is used for future transitions that are basedon the result of an algorithm.
The rules are loaded via {@link ZoneRulesProvider} using a {@link ZoneId}. The same rules may be shared internally between multiple zone IDs.
Serializing an instance of {@code ZoneRules} will store the entire set of rules.It does not store the zone ID as it is not part of the state of this object.
A rule implementation may or may not store full information about historic and future transitions, and the information stored is only as accurate as that supplied to the implementation by the rules provider. Applications should treat the data provided as representing the best information available to the implementation of this rule. @implSpec This class is immutable and thread-safe. @since 1.8
javax.time.calendar.zone.ZoneRules
The rules defining how the zone offset varies for a single time zone.
The rules model all the historic and future transitions for a time zone. The rules are loaded via {@link TimeZone} and {@link ZoneRulesGroup} andare specific to a group, region and version. The same rules may be shared between multiple versions, regions or even groups.
Serializing an instance of {@code ZoneRules} will store the entire setof rules. It does not store the group, region or version as they are not part of the state of this object.
ZoneRules is an abstract class and must be implemented with care to ensure other classes in the framework operate correctly. All instantiable implementations must be final, immutable and thread-safe. It is only intended that the abstract methods are overridden. Subclasses should be Serializable wherever possible. @author Stephen Colebourne
org.threeten.bp.zone.ZoneRules
The rules defining how the zone offset varies for a single time-zone.
The rules model all the historic and future transitions for a time-zone. {@link ZoneOffsetTransition} is used for known transitions, typically historic.{@link ZoneOffsetTransitionRule} is used for future transitions that are basedon the result of an algorithm.
The rules are loaded via {@link ZoneRulesProvider} using a {@link ZoneId}. The same rules may be shared internally between multiple zone IDs.
Serializing an instance of {@code ZoneRules} will store the entire set of rules.It does not store the zone ID as it is not part of the state of this object.
A rule implementation may or may not store full information about historic and future transitions, and the information stored is only as accurate as that supplied to the implementation by the rules provider. Applications should treat the data provided as representing the best information available to the implementation of this rule.
Specification for implementors
The supplied implementations of this class are immutable and thread-safe.

Examples of java.time.zone.ZoneRules

     * @throws DateTimeException if the result exceeds the supported range
     */
    public static OffsetDateTime ofInstant(Instant instant, ZoneId zone) {
        Objects.requireNonNull(instant, "instant");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        ZoneOffset offset = rules.getOffset(instant);
        LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
        return new OffsetDateTime(ldt, offset);
    }

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Examples of java.time.zone.ZoneRules

     *
     * @return the time-zone unique ID, not null
     */
    public ZoneId normalized() {
        try {
            ZoneRules rules = getRules();
            if (rules.isFixedOffset()) {
                return rules.getOffset(Instant.EPOCH);
            }
        } catch (ZoneRulesException ex) {
            // invalid ZoneRegion is not important to this method
        }
        return this;

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Examples of java.time.zone.ZoneRules

     * @throws ZoneRulesException if checking availability and the ID cannot be found
     */
    static ZoneRegion ofId(String zoneId, boolean checkAvailable) {
        Objects.requireNonNull(zoneId, "zoneId");
        checkName(zoneId);
        ZoneRules rules = null;
        try {
            // always attempt load for better behavior after deserialization
            rules = ZoneRulesProvider.getRules(zoneId, true);
        } catch (ZoneRulesException ex) {
            if (checkAvailable) {

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Examples of java.time.zone.ZoneRules

     * @return the offset time, not null
     */
    public static OffsetTime ofInstant(Instant instant, ZoneId zone) {
        Objects.requireNonNull(instant, "instant");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        ZoneOffset offset = rules.getOffset(instant);
        long localSecond = instant.getEpochSecond() + offset.getTotalSeconds();  // overflow caught later
        int secsOfDay = (int) Math.floorMod(localSecond, SECONDS_PER_DAY);
        LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + instant.getNano());
        return new OffsetTime(time, offset);
    }

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Examples of java.time.zone.ZoneRules

        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(zone, "zone");
        if (zone instanceof ZoneOffset) {
            return new ZonedDateTime(localDateTime, (ZoneOffset) zone, zone);
        }
        ZoneRules rules = zone.getRules();
        List<ZoneOffset> validOffsets = rules.getValidOffsets(localDateTime);
        ZoneOffset offset;
        if (validOffsets.size() == 1) {
            offset = validOffsets.get(0);
        } else if (validOffsets.size() == 0) {
            ZoneOffsetTransition trans = rules.getTransition(localDateTime);
            localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
            offset = trans.getOffsetAfter();
        } else {
            if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
                offset = preferredOffset;

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Examples of java.time.zone.ZoneRules

     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     * @throws DateTimeException if the result exceeds the supported range
     */
    private static ZonedDateTime create(long epochSecond, int nanoOfSecond, ZoneId zone) {
        ZoneRules rules = zone.getRules();
        Instant instant = Instant.ofEpochSecond(epochSecond, nanoOfSecond);  // TODO: rules should be queryable by epochSeconds
        ZoneOffset offset = rules.getOffset(instant);
        LocalDateTime ldt = LocalDateTime.ofEpochSecond(epochSecond, nanoOfSecond, offset);
        return new ZonedDateTime(ldt, offset, zone);
    }

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Examples of java.time.zone.ZoneRules

     */
    public static ZonedDateTime ofStrict(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(offset, "offset");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        if (rules.isValidOffset(localDateTime, offset) == false) {
            ZoneOffsetTransition trans = rules.getTransition(localDateTime);
            if (trans != null && trans.isGap()) {
                // error message says daylight savings for simplicity
                // even though there are other kinds of gaps
                throw new DateTimeException("LocalDateTime '" + localDateTime +
                        "' does not exist in zone '" + zone +

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Examples of java.time.zone.ZoneRules

        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(zone, "zone");
        if (zone instanceof ZoneOffset) {
            return new ChronoZonedDateTimeImpl<>(localDateTime, (ZoneOffset) zone, zone);
        }
        ZoneRules rules = zone.getRules();
        LocalDateTime isoLDT = LocalDateTime.from(localDateTime);
        List<ZoneOffset> validOffsets = rules.getValidOffsets(isoLDT);
        ZoneOffset offset;
        if (validOffsets.size() == 1) {
            offset = validOffsets.get(0);
        } else if (validOffsets.size() == 0) {
            ZoneOffsetTransition trans = rules.getTransition(isoLDT);
            localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
            offset = trans.getOffsetAfter();
        } else {
            if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
                offset = preferredOffset;

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Examples of java.time.zone.ZoneRules

     * @param instant  the instant, not null
     * @param zone  the zone identifier, not null
     * @return the zoned date-time, not null
     */
    static ChronoZonedDateTimeImpl<?> ofInstant(Chronology chrono, Instant instant, ZoneId zone) {
        ZoneRules rules = zone.getRules();
        ZoneOffset offset = rules.getOffset(instant);
        Objects.requireNonNull(offset, "offset");  // protect against bad ZoneRules
        LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
        ChronoLocalDateTimeImpl<?> cldt = (ChronoLocalDateTimeImpl<?>)chrono.localDateTime(ldt);
        return new ChronoZonedDateTimeImpl<>(cldt, offset, zone);
    }

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Examples of java.time.zone.ZoneRules

        Objects.requireNonNull(zone, "zone");
        // need to handle case where there is a gap from 11:30 to 00:30
        // standard ZDT factory would result in 01:00 rather than 00:30
        LocalDateTime ldt = atTime(LocalTime.MIDNIGHT);
        if (zone instanceof ZoneOffset == false) {
            ZoneRules rules = zone.getRules();
            ZoneOffsetTransition trans = rules.getTransition(ldt);
            if (trans != null && trans.isGap()) {
                ldt = trans.getDateTimeAfter();
            }
        }
        return ZonedDateTime.of(ldt, zone);

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Examples of ZoneRules

Specification for implementors

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules

Examples of java.time.zone.ZoneRules