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@ 2014-01-19T19:29:59Z

<?php

date_default_timezone_set('UTC');


$dates = array(
    '2014-01-20 20:00:00',
    '2014-01-21 20:00:00',
    '2014-01-22 14:00:00',
    '2014-01-22 20:00:00',
    '2014-01-23 20:00:00',
    '2014-01-25 20:00:00',
    '2014-01-26 20:00:00',
    '2014-01-31 20:00:00',
    '2014-02-01 20:00:00'
);


    function getDateRanges($dates) {        
        $tsArr = array_map('strtotime', $dates);
        $ranges = array();
        
        for ($i=0, $len = count($tsArr); $i < $len; $i++) {     

            $rstart = $tsArr[$i];
            $rend = $rstart;
    
            // determine the end of the range
            while (isset($tsArr[$i+1]) && ($tsArr[$i+1]-$tsArr[$i]) / (60*60) <= 24) {
                $rend = $tsArr[++$i];
            }
    
            // create DateTime objects to work with dates
            $startDate = new DateTime('@'.$rstart);
            $endDate = new DateTime('@'.$rend);
    
            // get date start and last day of month
            $start = $startDate->format('j');
            $lastDay = $startDate->format('t');
    
            // if last day of month, append month name
            if ($start == $lastDay)
                $start = $startDate->format('jS M');
            else 
                $start = $startDate->format('jS');
    
            // end date
            $end = $endDate->format('jS M ga');
    
            $ranges[] = $start.'-'.$end;
        }
        return $ranges;
    }




$arr = getDateRanges($dates);
echo implode(', ', $arr);

Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.12 - 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: 20th-23rd Jan 8pm, 25th-26th Jan 8pm, 31st Jan-1st Feb 8pm
Output for 5.1.0 - 5.1.6: Fatal error: Class 'DateTime' not found in /in/cVrfe on line 34
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Fatal error: Call to undefined function date_default_timezone_set() in /in/cVrfe on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: date_default_timezone_set() in /in/cVrfe on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: date_default_timezone_set() in /in/cVrfe on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: date_default_timezone_set() in /in/cVrfe on line 3

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