Example usage for java.time.zone ZoneRules getOffset

Introduction

In this page you can find the example usage for java.time.zone ZoneRules getOffset.

Prototype

public ZoneOffset getOffset(LocalDateTime localDateTime) 

Source Link

Document

Gets a suitable offset for the specified local date-time in these rules.

Usage

From source file:Main.java

public static void main(String[] args) {
    LocalDateTime now = LocalDateTime.now();
    ZoneId usChicago = ZoneId.of("America/Chicago");
    System.out.println("Zone ID:  " + usChicago.getId());

    ZoneRules rules = usChicago.getRules();
    System.out.println("isFixedOffset(): " + rules.isFixedOffset());
    ZoneOffset offset = rules.getOffset(now);
    System.out.println("Zone offset: " + offset);

    List<ZoneOffsetTransition> transitions = rules.getTransitions();
    System.out.println(transitions);

}

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From source file:org.nodatime.tzvalidate.Java8Dump.java

@Override
public ZoneTransitions getTransitions(String id, int fromYear, int toYear) {
    ZoneId zone = ZoneId.of(id);
    ZoneRules rules = zone.getRules();
    DateTimeFormatter nameFormat = DateTimeFormatter.ofPattern("zzz", Locale.US);
    ZoneTransitions transitions = new ZoneTransitions(id);

    Instant start = ZonedDateTime.of(fromYear, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant();
    transitions.addTransition(null, rules.getOffset(start).getTotalSeconds() * 1000,
            rules.isDaylightSavings(start), nameFormat.format(start.atZone(zone)));
    Instant end = ZonedDateTime.of(toYear, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant();

    ZoneOffsetTransition transition = rules.nextTransition(start.minusNanos(1));
    while (transition != null && transition.getInstant().isBefore(end)) {
        Instant instant = transition.getInstant();
        transitions.addTransition(new Date(instant.toEpochMilli()),
                rules.getOffset(instant).getTotalSeconds() * 1000, rules.isDaylightSavings(instant),
                nameFormat.format(instant.atZone(zone)));
        transition = rules.nextTransition(instant);
    }/*from   w ww. ja v a  2  s . co  m*/
    return transitions;
}

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From source file:org.openhab.binding.airvisualnode.internal.handler.AirVisualNodeHandler.java

private State getChannelState(String channelId, NodeData nodeData) {
    State state = UnDefType.UNDEF;

    // Handle system channel IDs separately, because 'switch/case' expressions must be constant expressions
    if (CHANNEL_BATTERY_LEVEL.equals(channelId)) {
        state = new DecimalType(BigDecimal.valueOf(nodeData.getStatus().getBattery()).longValue());
    } else if (CHANNEL_WIFI_STRENGTH.equals(channelId)) {
        state = new DecimalType(
                BigDecimal.valueOf(Math.max(0, nodeData.getStatus().getWifiStrength() - 1)).longValue());
    } else {/*from   w  w w  .j  ava2  s. c om*/
        // Handle binding-specific channel IDs
        switch (channelId) {
        case CHANNEL_CO2:
            state = new QuantityType<>(nodeData.getMeasurements().getCo2Ppm(), PARTS_PER_MILLION);
            break;
        case CHANNEL_HUMIDITY:
            state = new QuantityType<>(nodeData.getMeasurements().getHumidityRH(), PERCENT);
            break;
        case CHANNEL_AQI_US:
            state = new QuantityType<>(nodeData.getMeasurements().getPm25AQIUS(), ONE);
            break;
        case CHANNEL_PM_25:
            // PM2.5 is in ug/m3
            state = new QuantityType<>(nodeData.getMeasurements().getPm25Ugm3(),
                    MICRO(GRAM).divide(CUBIC_METRE));
            break;
        case CHANNEL_TEMP_CELSIUS:
            state = new QuantityType<>(nodeData.getMeasurements().getTemperatureC(), CELSIUS);
            break;
        case CHANNEL_TIMESTAMP:
            // It seem the Node timestamp is Unix timestamp converted from UTC time plus timezone offset.
            // Not sure about DST though, but it's best guess at now
            Instant instant = Instant.ofEpochMilli(nodeData.getStatus().getDatetime() * 1000L);
            ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.of("UTC"));
            ZoneId zoneId = ZoneId.of(nodeData.getSettings().getTimezone());
            ZoneRules zoneRules = zoneId.getRules();
            zonedDateTime.minus(Duration.ofSeconds(zoneRules.getOffset(instant).getTotalSeconds()));
            if (zoneRules.isDaylightSavings(instant)) {
                zonedDateTime.minus(Duration.ofSeconds(zoneRules.getDaylightSavings(instant).getSeconds()));
            }
            state = new DateTimeType(zonedDateTime);
            break;
        case CHANNEL_USED_MEMORY:
            state = new DecimalType(BigDecimal.valueOf(nodeData.getStatus().getUsedMemory()).longValue());
            break;
        }
    }

    return state;
}

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