leben-jp

<?php
function convGtJDate($src) {
    list($year, $month, $day) = explode('/', $src);
    if (!@checkdate($month, $day, $year) || $year < 1869 || strlen($year) !== 4
            || strlen($month) !== 2 || strlen($day) !== 2) return false;
    $date = str_replace('/', '', $src);
    if ($date >= 20190501) {
        $gengo = '令和';
        $wayear = $year - 2018;
    }elseif ($date >= 19890108) {