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@ 2016-01-30T09:14:30Z

<?php
$list = array(
    '2016-01-29' => array(
        array(
            'date' => 'January 29',
            'time' => '8:30 am',
            'datetime' => '2016-01-29T08:30:00-06:00',
            'alldayflag' => 0
        ),
        array(
            'date' => 'January 29',
            'time' => '12:00 am',
            'datetime' => '2016-01-29T00:00:00-06:00',
            'alldayflag' => 1
        ),
        array(
            'date' => 'January 29',
            'time' => '2:00 pm',
            'datetime' => '2016-01-29T14:00:00-06:00',
            'alldayflag' => 0
        ),
        array(
            'date' => 'January 29',
            'time' => '10:00 am',
            'datetime' => '2016-01-29T10:00:00-06:00',
            'alldayflag' => 0
        ),
        array(
            'date' => 'January 29',
            'time' => '10:00 am',
            'datetime' => '2016-01-29T10:00:00-06:00',
            'alldayflag' => 1
        ),
        array(
            'date' => 'January 29',
            'time' => '12:00 pm',
            'datetime' => '2016-01-29T12:00:00-06:00',
            'alldayflag' => 0
        ),
    ),
    '2016-01-30' => array(
        array(
            'date' => 'January 30',
            'time' => '4:00 pm',
            'datetime' => '2016-01-30T16:00:00-06:00',
            'alldayflag' => 0
        ),
        array(
            'date' => 'January 30',
            'time' => '5:00 pm',
            'datetime' => '2016-01-30T17:00:00-06:00',
            'alldayflag' => 1
        ),
        array(
            'date' => 'January 30',
            'time' => '5:00 pm',
            'datetime' => '2016-01-30T17:00:00-06:00',
            'alldayflag' => 0
        ),
        array(
            'date' => 'January 30',
            'time' => '11:00 am',
            'datetime' => '2016-01-30T11:00:00-06:00',
            'alldayflag' => 0
        ),
    )
);

function sortCriteria($a, $b)
{
    $aDateTime = new DateTime($a['datetime']);
    $bDateTime = new DateTime($b['datetime']);

    if ($aDateTime == $bDateTime) {
        return ($a['alldayflag'] > $b['alldayflag']) ? -1 : 1;
    }

    return ($aDateTime < $bDateTime) ? -1 : 1;
}

$getBeginDate = '2016-01-29';
$getEndDate = '2016-01-31';
$getCurrentDate = $getBeginDate;

while(strtotime($getCurrentDate) < strtotime($getEndDate)) {
    usort($list[$getCurrentDate], 'sortCriteria');
    $getCurrentDate = date('Y-m-d', strtotime($getCurrentDate . " +1 day"));
}

print_r($list);

Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Array ( [2016-01-29] => Array ( [0] => Array ( [date] => January 29 [time] => 12:00 am [datetime] => 2016-01-29T00:00:00-06:00 [alldayflag] => 1 ) [1] => Array ( [date] => January 29 [time] => 8:30 am [datetime] => 2016-01-29T08:30:00-06:00 [alldayflag] => 0 ) [2] => Array ( [date] => January 29 [time] => 10:00 am [datetime] => 2016-01-29T10:00:00-06:00 [alldayflag] => 1 ) [3] => Array ( [date] => January 29 [time] => 10:00 am [datetime] => 2016-01-29T10:00:00-06:00 [alldayflag] => 0 ) [4] => Array ( [date] => January 29 [time] => 12:00 pm [datetime] => 2016-01-29T12:00:00-06:00 [alldayflag] => 0 ) [5] => Array ( [date] => January 29 [time] => 2:00 pm [datetime] => 2016-01-29T14:00:00-06:00 [alldayflag] => 0 ) ) [2016-01-30] => Array ( [0] => Array ( [date] => January 30 [time] => 11:00 am [datetime] => 2016-01-30T11:00:00-06:00 [alldayflag] => 0 ) [1] => Array ( [date] => January 30 [time] => 4:00 pm [datetime] => 2016-01-30T16:00:00-06:00 [alldayflag] => 0 ) [2] => Array ( [date] => January 30 [time] => 5:00 pm [datetime] => 2016-01-30T17:00:00-06:00 [alldayflag] => 1 ) [3] => Array ( [date] => January 30 [time] => 5:00 pm [datetime] => 2016-01-30T17:00:00-06:00 [alldayflag] => 0 ) ) )

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