Use this code
$months = array('Jan'=>1,'Feb'=>2,'Mar'=>3,'Apr'=>4,'May'=>' 5', 'Jun'=>6,'Jul'=>7,'Aug'=>8,'Sep'=>9, 'Oct'=>10,'Nov'=>11,'Dec'=>12);$month_no = $months[$month_name];
As for your conversion. You can just try using the strtotime function. Followed by the date() function. Convert the time into unix timestamp using the strtotime function. Then change it into the format of your choice using the date() function.
Good luck
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