How to convert payment_date in Paypal IPN for the format d.m.Y?

How to convert payment_date in Paypal IPN for the format d.m.Y?

I installed IPN PayPal as payment method for my web-site. And I made SQL
Base for receiving IPN history from PayPal system. But I want to convert
payment_data from PayPal in the following format (d.m.Y) incase of Y-m-d
H:i:s