Examples of java.time.zone.ZoneOffsetTransition

java.time.zone.ZoneOffsetTransition
A transition between two offsets caused by a discontinuity in the local time-line.
A transition between two offsets is normally the result of a daylight savings cutover. The discontinuity is normally a gap in spring and an overlap in autumn. {@code ZoneOffsetTransition} models the transition between the two offsets.
Gaps occur where there are local date-times that simply do not not exist. An example would be when the offset changes from {@code +03:00} to {@code +04:00}. This might be described as 'the clocks will move forward one hour tonight at 1am'.
Overlaps occur where there are local date-times that exist twice. An example would be when the offset changes from {@code +04:00} to {@code +03:00}. This might be described as 'the clocks will move back one hour tonight at 2am'. @implSpec This class is immutable and thread-safe. @since 1.8

        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;
            } else {
                offset = Objects.requireNonNull(validOffsets.get(0), "offset");  // protect against bad ZoneRules

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        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 +
                        "' due to a gap in the local time-line, typically caused by daylight savings");

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     *
     * @return a {@code ZonedDateTime} based on this date-time with the earlier offset, not null
     */
    @Override
    public ZonedDateTime withEarlierOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(dateTime);
        if (trans != null && trans.isOverlap()) {
            ZoneOffset earlierOffset = trans.getOffsetBefore();
            if (earlierOffset.equals(offset) == false) {
                return new ZonedDateTime(dateTime, earlierOffset, zone);
            }
        }
        return this;

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     *
     * @return a {@code ZonedDateTime} based on this date-time with the later offset, not null
     */
    @Override
    public ZonedDateTime withLaterOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(toLocalDateTime());
        if (trans != null) {
            ZoneOffset laterOffset = trans.getOffsetAfter();
            if (laterOffset.equals(offset) == false) {
                return new ZonedDateTime(dateTime, laterOffset, zone);
            }
        }
        return this;

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        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;
            } else {
                offset = validOffsets.get(0);

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        return offset;
    }


    @Override
    public ChronoZonedDateTime<D> withEarlierOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
        if (trans != null && trans.isOverlap()) {
            ZoneOffset earlierOffset = trans.getOffsetBefore();
            if (earlierOffset.equals(offset) == false) {
                return new ChronoZonedDateTimeImpl<>(dateTime, earlierOffset, zone);
            }
        }
        return this;

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        return this;
    }


    @Override
    public ChronoZonedDateTime<D> withLaterOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
        if (trans != null) {
            ZoneOffset offset = trans.getOffsetAfter();
            if (offset.equals(getOffset()) == false) {
                return new ChronoZonedDateTimeImpl<>(dateTime, offset, zone);
            }
        }
        return this;

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Related Classes of java.time.zone.ZoneOffsetTransition

java.time.ZoneOffset

java.io.InvalidObjectException

java.time.LocalDate

java.time.chrono.ChronoZonedDateTimeImpl

java.time.ZonedDateTime

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