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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', $date2)->addDAy(); return floor($first->diff($second)->days/7); } var_dump(datediffInWeeks('1/1/2013', '1/7/2013'));// 21 var_dump(datediffInWeeks('6/4/2013', '1/2/2013'));// 21
based on Ei59V
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined method DateTime::addDAy() in /in/iCJgN:6 Stack trace: #0 /in/iCJgN(10): datediffInWeeks('1/1/2013', '1/7/2013') #1 {main} thrown in /in/iCJgN on line 6
Process exited with code 255.
Output for 5.3.18 - 5.6.28
Fatal error: Call to undefined method DateTime::addDAy() in /in/iCJgN on line 6
Process exited with code 255.