DateTimeZone::getOffset

timezone_offset_get

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

DateTimeZone::getOffset -- timezone_offset_getReturns the timezone offset from GMT

Descrizione

Stile orientato agli oggetti

public DateTimeZone::getOffset(DateTimeInterface $datetime): int

Stile procedurale

This function returns the offset to GMT for the date/time specified in the datetime parameter. The GMT offset is calculated with the timezone information contained in the DateTimeZone object being used.

Elenco dei parametri

oggetto

Solo per lo stile procedurale: Un oggetto DateTimeZone restituito da timezone_open()

datetime

DateTime that contains the date/time to compute the offset from.

Valori restituiti

Returns time zone offset in seconds.

Esempi

Example #1 DateTimeZone::getOffset() examples

<?php
// Create two timezone objects, one for Taipei (Taiwan) and one for
// Tokyo (Japan)
$dateTimeZoneTaipei = new DateTimeZone("Asia/Taipei");
$dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");

// Create two DateTime objects that will contain the same Unix timestamp, but
// have different timezones attached to them.
$dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);

// Calculate the GMT offset for the date/time contained in the $dateTimeTaipei
// object, but using the timezone rules as defined for Tokyo
// ($dateTimeZoneJapan).
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);

// Should show int(32400) (for dates after Sat Sep 8 01:00:00 1951 JST).
var_dump($timeOffset);
?>

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User Contributed Notes 2 notes

up
0
Anonymous
2 years ago
int offset does not cover fractional offsets of "rogue" locations such as Nepal etc.
up
-4
Daniel Vidal
2 years ago
Note that the DateTime parameter has no effect in the result returned by DateTimeZone::getOffset($DateTime), unless, it refers to a DateTime where there is daylight savings in the referenced DateTimeZone.

Ex.:
<?php
$timezone_brl   
= new DateTimeZone('America/Sao_Paulo');
$timezone_eng    = new DateTimeZone('Europe/London');
$timezone_aus    = new DateTimeZone('Australia/Brisbane');

$dateTimes = [
      new
DateTime()
    , new
DateTime('now', $timezone_eng)
    , new
DateTime('now', $timezone_aus)
    , new
DateTime('now', $timezone_brl)
    , new
DateTime('2000-06-10', $timezone_brl)
    , new
DateTime('2000-12-10', $timezone_brl)
    , new
DateTime('2020-12-10', $timezone_brl)
];

foreach(
$dateTimes as $dateTime)
{
  echo
"\n" . $timezone_brl->getOffset($dateTime);
}
/**
* -10800
* -10800
* -10800
* -10800
* -10800  // No daylight savings in June/2000
* -  7200  // Brazil had daylight savings until 2020
* -10800  // No more daylight savings, so it returns -10800
*/

?>
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