how to change date format on this html user form

Question

I have the html form which enter data into mysql DB, but in input field of date it has this format,

(mm/dd/yyyy) 

BUT I prefer to use this form

Answer 1

You should be storing your dates as actual dates and not strings. You're only making your life more difficult by storing them in a non-standard format.

But if you insist on using this format, this code will work for you:

$original = DateTime::createFromFormat('m/d/Y', '04/18/1973');
$date     = $original->format('d/m/Y');