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@ 2019-03-23T04:06:51Z

<?php

function display(\DateTimeInterface $start, \DateTimeInterface $end) 
{
    echo $start->format('Y-m-d H:i T') . ' to ' . $end->format('Y-m-d H:i T') . \PHP_EOL;
    
    $periods = new \DatePeriod($start, new \DateInterval('PT1H'), $end);
    $hours = iterator_count($periods);
    echo $hours . ' hours (iterator_count)';
    echo \PHP_EOL;
    
    $diff = $end->getTimestamp() - $start->getTimestamp();
    $hours = $diff / ( 60 * 60 );
    echo $hours . ' hours (60 * 60)';
    echo \PHP_EOL;
    
    $diff = $end->diff($start);
    $hours = $diff->h + ($diff->days * 24);
    echo $hours . ' hours (days * 24)';
}

function go(\DateTimezone $tz) 
{
    date_default_timezone_set($tz->getName());
    
    //DST starts Apr. 2nd 02:00 and moves to 03:00
    display(
        new \DateTime('2006-04-01T12:00:00'), 
        new \DateTime('2006-04-02T12:00:00')
    );
    echo \PHP_EOL . \PHP_EOL;
    
    //DST ends Oct. 29th 02:00 and moves to 01:00
    display(
        new \DateTime('2006-10-28T12:00:00'), 
        new \DateTime('2006-10-29T12:00:00')
    );
    echo \PHP_EOL . \PHP_EOL;
    
    //full year
    display(
        new \DateTime('2006-01-01T12:00:00'), 
        new \DateTime('2007-01-01T12:00:00')
    );
}

go(new \DateTimezone('America/New_York'));

echo \PHP_EOL . \PHP_EOL . '---------' . \PHP_EOL . \PHP_EOL;

go(new \DateTimezone('UTC'));

Output for git.master, git.master_jit, rfc.property-hooks: 2006-04-01 12:00 EST to 2006-04-02 12:00 EDT 23 hours (iterator_count) 23 hours (60 * 60) 24 hours (days * 24) 2006-10-28 12:00 EDT to 2006-10-29 12:00 EST 24 hours (iterator_count) 25 hours (60 * 60) 24 hours (days * 24) 2006-01-01 12:00 EST to 2007-01-01 12:00 EST 8759 hours (iterator_count) 8760 hours (60 * 60) 8760 hours (days * 24) --------- 2006-04-01 12:00 UTC to 2006-04-02 12:00 UTC 24 hours (iterator_count) 24 hours (60 * 60) 24 hours (days * 24) 2006-10-28 12:00 UTC to 2006-10-29 12:00 UTC 24 hours (iterator_count) 24 hours (60 * 60) 24 hours (days * 24) 2006-01-01 12:00 UTC to 2007-01-01 12:00 UTC 8760 hours (iterator_count) 8760 hours (60 * 60) 8760 hours (days * 24)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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