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<?php var_dump(date('Y-m-d',strtotime("+1 years", strtotime(str_replace("/","-", '20/12/2013')))));
Output for 5.1.3 - 7.1.0
string(10) "2014-12-20"
Output for 5.1.0 - 5.1.2
string(10) "1970-01-01"
Output for 4.3.0 - 5.0.5
string(10) "2027-06-05"