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<?php function datediffInWeeks($date1, $date2) { if($date1 > $date2) return datediffInWeeks($date2, $date1); $first = DateTime::createFromFormat('m/d/Y', $date1); $second = DateTime::createFromFormat('m/d/Y', $date2); return floor($first->diff($second)->days/7); } $q = new DateTime('First Week of 2015'); var_dump($q);// 21
based on qvRlO
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (First Week of 2015) at position 0 (F): The timezone could not be found in the database in /in/0ZsAG:9 Stack trace: #0 /in/0ZsAG(9): DateTime->__construct('First Week of 2...') #1 {main} thrown in /in/0ZsAG on line 9
Process exited with code 255.
Output for 5.3.19 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (First Week of 2015) at position 0 (F): The timezone could not be found in the database' in /in/0ZsAG:9 Stack trace: #0 /in/0ZsAG(9): DateTime->__construct('First Week of 2...') #1 {main} thrown in /in/0ZsAG on line 9
Process exited with code 255.