how to change the dd-mm-yyyy to yyyy-mm-dd using numpy datetime64 code example

Example 1: how to set datetime format in python

import datetime

x = datetime.datetime(2018, 9, 15)

print(x.strftime("%b %d %Y %H:%M:%S"))

Example 2: php change date format from d/m/y to y-m-d

$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));