IntlTimeZone::__construct — Private constructor to disallow direct instantiation
IntlTimeZone::countEquivalentIDs — Get the number of IDs in the equivalency group that includes the given ID
IntlTimeZone::createDefault — Create a new copy of the default timezone for this host
IntlTimeZone::createEnumeration — Get an enumeration over time zone IDs associated with the given country or offset
IntlTimeZone::createTimeZone — Create a timezone object for the given ID
IntlTimeZone::createTimeZoneIDEnumeration — Get an enumeration over system time zone IDs with the given filter conditions
IntlTimeZone::fromDateTimeZone — Create a timezone object from DateTimeZone
IntlTimeZone::getCanonicalID — Get the canonical system timezone ID or the normalized custom time zone ID for the given time zone ID
IntlTimeZone::getDisplayName — Get a name of this time zone suitable for presentation to the user
IntlTimeZone::getDSTSavings — Get the amount of time to be added to local standard time to get local wall clock time
IntlTimeZone::getEquivalentID — Get an ID in the equivalency group that includes the given ID
IntlTimeZone::getErrorCode — Get last error code on the object
IntlTimeZone::getErrorMessage — Get last error message on the object
IntlTimeZone::getGMT — Create GMT (UTC) timezone
IntlTimeZone::getID — Get timezone ID
IntlTimeZone::getIDForWindowsID — Translate a Windows timezone into a system timezone
IntlTimeZone::getOffset — Get the time zone raw and GMT offset for the given moment in time
IntlTimeZone::getRawOffset — Get the raw GMT offset (before taking daylight savings time into account
IntlTimeZone::getRegion — Get the region code associated with the given system time zone ID
IntlTimeZone::getTZDataVersion — Get the timezone data version currently used by ICU
IntlTimeZone::getUnknown — Get the "unknown" time zone
IntlTimeZone::getWindowsID — Translate a system timezone into a Windows timezone
IntlTimeZone::hasSameRules — Check if this zone has the same rules and offset as another zone
IntlTimeZone::toDateTimeZone — Convert to DateTimeZone object
IntlTimeZone::useDaylightTime — Check if this time zone uses daylight savings time

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User Contributed Notes 1 note

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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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