<?php
/** solution 1 */
$date1 = "1900-00-00";
$date2 = "2000-00-00";
$dt1 = new DateTime($date1);
$dt2 = new DateTime($date2);
$diff = $dt1->diff($dt2);
printf("%d years, %d months, %d days", $diff->y, $diff->m, $diff->d);
/** solution 2 */
$diff = date_diff(new DateTime("1900-00-00"), new DateTime("2000-00-00"));
printf("%d years, %d months, %d days", $diff->y, $diff->m, $diff->d);
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