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<?php $fecha = "20/04/2015 18:11:54"; list($d, $M, $y, $h, $m, $s) = preg_split("/[\s,\/:]+/",$fecha); echo "\n->"; echo strtotime("$d-$M-$y $h:$m:$s") - 1429571959; echo "\n->"; echo strtotime("2015-20-04 18:11:54") - 1429571959; echo "\n->"; echo strtotime("20/04/2015 18:11:54") . 'No funciona';
Output for 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
->-25645 ->-1429571959 ->No funciona
Output for 7.3.32 - 7.3.33, 8.0.13
->-18445 ->-1429571959 ->No funciona
Output for 5.1.0 - 5.1.2
->-1429571959 ->15209741 ->No funciona
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
->330195155 ->40755155 ->1470327114No funciona

preferences:
241.17 ms | 402 KiB | 309 Q