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    IntlTimeZone クラス

    (PHP 5 >= 5.5.0, PHP 7, PHP 8, PECL >= 3.0.0a1)

    はじめに

    クラス概要

    class IntlTimeZone {
    /* 定数 */
    public const int DISPLAY_SHORT;
    public const int DISPLAY_LONG;
    public const int DISPLAY_SHORT_GENERIC;
    public const int DISPLAY_LONG_GENERIC;
    public const int DISPLAY_SHORT_GMT;
    public const int DISPLAY_LONG_GMT;
    public const int DISPLAY_SHORT_COMMONLY_USED;
    public const int DISPLAY_GENERIC_LOCATION;
    public const int TYPE_ANY;
    public const int TYPE_CANONICAL;
    public const int TYPE_CANONICAL_LOCATION;
    /* メソッド */
    private __construct()
    public static countEquivalentIDs(string $timezoneId): int|false
    public static createDefault(): IntlTimeZone
    public static createEnumeration(IntlTimeZone|string|int|float|null $countryOrRawOffset = null): IntlIterator|false
    public static createTimeZone(string $timezoneId): ?IntlTimeZone
    public static createTimeZoneIDEnumeration(int $type, ?string $region = null, ?int $rawOffset = null): IntlIterator|false
    public static fromDateTimeZone(DateTimeZone $timezone): ?IntlTimeZone
    public static getCanonicalID(string $timezoneId, bool &$isSystemId = null): string|false
    public getDisplayName(bool $dst = false, int $style = IntlTimeZone::DISPLAY_LONG, ?string $locale = null): string|false
    public getDSTSavings(): int
    public static getEquivalentID(string $timezoneId, int $offset): string|false
    public getErrorCode(): int|false
    public getErrorMessage(): string|false
    public static getGMT(): IntlTimeZone
    public getID(): string|false
    public static getIDForWindowsID(string $timezoneId, ?string $region = null): string|false
    public getOffset(
        float $timestamp,
        bool $local,
        int &$rawOffset,
        int &$dstOffset
    ): bool
    public getRawOffset(): int
    public static getRegion(string $timezoneId): string|false
    public static getTZDataVersion(): string|false
    public static getUnknown(): IntlTimeZone
    public static getWindowsID(string $timezoneId): string|false
    public hasSameRules(IntlTimeZone $other): bool
    public toDateTimeZone(): DateTimeZone|false
    public useDaylightTime(): bool
    }

    目次

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    User Contributed Notes 1 note

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    2
    Anonymous
    6 years ago
    Currently there is no documentation available for IntlTimeZone::parse(), so it took some while to figure out a working example:

    <?php
    // Example for 32-bit PHP 7.0.30 with Intl version 1.1, ICU version 56.1
    // To get the offset of a date including daylight saving time, getRawOffset() is
    // not sufficient, getOffset() is needed. And a date is needed to take history
    // in to account.

    \Locale::setDefault('nl-NL');
    $date = '25-03-2018 12:34:56.123456 CEST'; // 3rd of Februari
    $timezone = \IntlTimeZone::createDefault(); // = CEST = GMT +02:00
    print 'Time zone: ' . $timezone->getDisplayName() . PHP_EOL;
    print     'DST: ' . ($timezone->useDaylightTime() ? 'DOES' : 'DOES NOT')
    .     ' happen to this timezone' . PHP_EOL;
    print     'Possible DST difference (usec): ' . $timezone->getDSTSavings() . PHP_EOL;

    $formatter = new \IntlDateFormatter(
    \Locale::getDefault(),
    \IntlDateFormatter::MEDIUM,
    \IntlDateFormatter::MEDIUM,
    $timezone
    );
    $timestamp = $formatter->parse($date);
    if (    FALSE === $timestamp) {
    throw new     \Exception('Can not parse date');
    }
    elseif (    is_float($timestamp)) {
    throw new     \Exception('Y2K38 bug @ 32 bit, please use 64 bit');
    }
    print     'Date parsed by IntlFormatter::parse(): ' . date('c', $timestamp)
    .     PHP_EOL;

    $cal = \IntlCalendar::createInstance();
    $cal->setTimeZone($timezone);
    $cal->setLenient(FALSE);
    // set UNIX timestamp offset (1970-01-01 00:00:00.000000) and add the timestamp
    $cal->set(1970, 0, 1, 0, 0, 0);
    $cal->set(\IntlCalendar::FIELD_MILLISECOND, 0); // note: msec, not usec
    $cal->add(\IntlCalendar::FIELD_SECOND, $timestamp); // note: no milliseconds
    $cal->add(\IntlCalendar::FIELD_MILLISECOND, 124); // hardcode for simplicity

    header('Content-type: text/plain');
    print     'Date constructed with IntlCalendar: ' . $formatter->format($cal)
    .     PHP_EOL;
    print     'Raw offset by getRawOffset(): ' . $timezone->getRawOffset() . PHP_EOL;

    /**
    * Function IntlTimeZone::getOffset()
    * @link http://icu-project.org/apiref/icu4c/classicu_1_1TimeZone.html#afcbc1c48bf0b453b0123c4cb75d20e96
    * @param float $date
    * moment in time for which to return offsets, in units of milliseconds from
    * January 1, 1970 0:00 GMT, either GMT time or local wall time, depending on
    * `local'.
    * @param bool $local
    * if true, `date' is local wall time; otherwise it is in GMT time.
    * @param int &$rawOffset
    * output parameter to receive the raw offset, that is, the offset not
    * including DST adjustments
    * @param int &$dstOffset
    * output parameter to receive the DST offset, that is, the offset to be added
    * to `rawOffset' to obtain the total offset between local and GMT time. If
    * DST is not in effect, this value is zero; otherwise it is a positive value,
    * typically one hour.
    */

    $rawOffset = NULL;
    $dstOffset = NULL;
    $timestamp *= 1000.0; // convert unix timestamp from secs to msecs
    $timezone->getOffset($timestamp, $local = FALSE, $rawOffset, $dstOffset);
    print     'Output of getOffset():' . PHP_EOL . json_encode([
    'rawOffset' => $rawOffset,
    'dstOffset' => $dstOffset
    ], JSON_PRETTY_PRINT) . PHP_EOL;
    ?>
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