PHP 7.1.12 Released

DateTimeZone::getTransitions

timezone_transitions_get

(PHP 5 >= 5.2.0, PHP 7)

DateTimeZone::getTransitions -- timezone_transitions_getRetorna todas as transições do fuso horário

Descrição

Estilo orientado à objeto

public array DateTimeZone::getTransitions ([ int $timestamp_begin [, int $timestamp_end ]] )

Estilo procedural

array timezone_transitions_get ( DateTimeZone $object [, int $timestamp_begin [, int $timestamp_end ]] )

Parâmetros

object

Somente no estilo procedural: Um objeto DateTimeZone retornado por timezone_open()

timestamp_begin

Timestamp inicial.

timestamp_end

Timestamp final.

Valor Retornado

Retorna um array numericamente indexado contendo um array associativo com todas as transições, em caso de sucesso ou FALSE em caso de falha.

Changelog

Versão Descrição
5.3.0 Os parâmetros opcionais timestamp_begin e timestamp_end foram adicionados.

Exemplos

Exemplo #1 Exemplo do método timezone_transitions_get()

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

O exemplo acima irá imprimir algo similar à:

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
7 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
4 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
4 years ago
Beware if you use getTransitions() without a minimum date, it can be slow...
up
-3
rubo77
4 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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