Change MKTIME to DD-MM-YY?

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PHP

Hi
I have set up calendar feature, and I want the date to come across as DD-MM-YY

at the moment, below code is in mktime.

Can someone help?

What I have tried:

define('START_DAY', (int) date('N', mktime(0,0,0,CURRENT_MONTH_N,1, CURRENT_YEAR)) - 1);