timezone_offset_get

(PHP 5 >= 5.1.0)

timezone_offset_get — Returns the timezone offset from GMT

Descripción

int timezone_offset_get ( DateTimeZone $object , DateTime $datetime )

int DateTimeZone::getOffset ( DateTime $datetime )

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 DateTime object being used.

Lista de parámetros

object: DateTimeZone object.
datetime: DateTime that contains the date/time to compute the offset from.

Valores retornados

Returns time zone offset in seconds on success or FALSE on failure.

Ejemplos

Example #1 timezone_offset_get() 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);
?>

add a note User Contributed Notes
timezone_offset_get

richard at phase dot org
20-Mar-2007 12:05


The following extended example may make the usage clearer; 

<?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);



// NOTE: $dateTimeJapan is not used further in this example



// 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).

print("Number of seconds Japan is ahead of GMT at the specific time: ");

var_dump($timeOffset);



print("<br />Number of seconds Taipei is ahead of GMT at the specific time: ");

var_dump($dateTimeZoneTaipei->getOffset($dateTimeTaipei));



print("<br />Number of seconds Japan is ahead of Taipei at the specific time: ");

var_dump($dateTimeZoneJapan->getOffset($dateTimeTaipei)

     -$dateTimeZoneTaipei->getOffset($dateTimeTaipei));



print("<hr />");



?>



Number of seconds Japan is ahead of GMT at the specific time: int(32400)

Number of seconds Taipei is ahead of GMT at the specific time: int(28800)

Number of seconds Japan is ahead of Taipei at the specific time: int(3600)

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Last updated: Fri, 11 Apr 2008