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DateTimeZone::getTransitions

timezone_transitions_get

(PHP 5 >= 5.2.0, PHP 7)

DateTimeZone::getTransitions -- timezone_transitions_getReturns all transitions for the timezone

Beschreibung

Objektorientierter Stil

public DateTimeZone::getTransitions ([ int $timestampBegin = PHP_INT_MIN [, int $timestampEnd = PHP_INT_MAX ]] ) : array

Prozeduraler Stil

timezone_transitions_get ( DateTimeZone $object [, int $timestampBegin = PHP_INT_MIN [, int $timestampEnd = PHP_INT_MAX ]] ) : array

Parameter-Liste

object

Nur bei prozeduralem Aufruf: Ein von date_create() zurückgegebens DateTimeZone Objekt.

timestampBegin

Begin timestamp.

timestampEnd

End timestamp.

Rückgabewerte

Returns numerically indexed array containing associative array with all transitions on successIm Fehlerfall wird FALSE zurückgegeben..

Changelog

Version Beschreibung
5.3.0 The optional timestampBegin and timestampEnd were added.

Beispiele

Beispiel #1 A timezone_transitions_get() example

<?php
$timezone 
= new DateTimeZone("Europe/London");
$transitions $timezone->getTransitions();
print_r(array_slice($transitions03));
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Array
(
    [0] => Array
        (
            [ts] => -9223372036854775808
            [time] => -292277022657-01-27T08:29:52+0000
            [offset] => 3600
            [isdst] => 1
            [abbr] => BST
        )

    [1] => Array
        (
            [ts] => -1691964000
            [time] => 1916-05-21T02:00:00+0000
            [offset] => 3600
            [isdst] => 1
            [abbr] => BST
        )

    [2] => Array
        (
            [ts] => -1680472800
            [time] => 1916-10-01T02:00:00+0000
            [offset] => 0
            [isdst] => 
            [abbr] => GMT
        )

)

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User Contributed Notes 4 notes

up
6
scotts
10 years ago
Getting a timezone's offset and other data at a specified point in time (now, for example) using the new PHP5.3 parameters:

<?php
$theTime
= time(); # specific date/time we're checking, in epoch seconds.

$tz = new DateTimeZone('America/Los_Angeles');
$transition = $tz->getTransitions($theTime,$theTime);

# only one array should be returned into $transition. Now get the data:
$offset = $transition[0]['offset'];
$abbr = $transition[0]['abbr'];
?>

Before PHP5.3, you'd have to loop through all of the Transitions up until the current point in time, which would be a very inefficient process.
up
4
rubo77
6 years ago
This will work  in PHP_VERSION < 5.3:

<?php
/** returns an array with two elements for spring and fall DST in a given year
*  works in PHP_VERSION < 5.3
*
* @param integer $year
* @param string $tz timezone
* @return array
**/
function getTransitionsForYear($year=null, $tz = null){
    if(!
$year) $year=date("Y");

    if (!
$tz) $tz = date_default_timezone_get();
   
$timeZone = new DateTimeZone($tz);

    if (
version_compare(PHP_VERSION, '5.3.0') >= 0) {
       
$transitions = $timeZone->getTransitions(mktime(0, 0, 0, 2, 1, $year),mktime(0, 0, 0, 11, 31, $year));
       
$index=1;
    } else {
       
// since 1980 it is regular, the 29th element is 1980-04-06
            // change this in your timezone
           
$first_regular_index=29;
           
$first_regular_year=1980;
       
$transitions = $timeZone->getTransitions();
       
$index=($year-$first_regular_year)*2+$first_regular_index;
    }
    return
array_slice($transitions, $index, 2);
}
up
1
tanguy dot pruvot at gmail dot com
7 years ago
Beware if you use getTransitions() without a minimum date, it can be slow...
up
-3
rubo77
6 years ago
This function will work in PHP < 5.3 :

/** returns an array with two elements for spring and fall DST in a given year
*
* @param integer $year
* @param string $tz timezone
* @return array
**/
function getTransitionsForYear($year=null, $tz = null){
    if(!$year) $year=date("Y");
   
    if (!$tz) $tz = date_default_timezone_get();
    $timeZone = new DateTimeZone($tz);
   
    $transitions = $timeZone->getTransitions(mktime(0, 0, 0, 1, 1, $year));
    return array_slice($transitions, 1, 2);
}
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