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<?php var_dump(date('Y-m-d',strtotime("+1 years", strtotime(str_replace("/","-", '2013/12/20')))));
based on 8XMVC
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(10) "2014-12-20"