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Forked from kazua/convDate2.php
Last active September 2, 2020 20:02
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PHPで西暦⇔和暦変換
<?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) {
$gengo = '平成';
$wayear = $year - 1988;
} elseif ($date >= 19261225) {
$gengo = '昭和';
$wayear = $year - 1925;
} elseif ($date >= 19120730) {
$gengo = '大正';
$wayear = $year - 1911;
} else {
$gengo = '明治';
$wayear = $year - 1868;
}
switch ($wayear) {
case 1:
$wadate = $gengo.'元年'.$month.'月'.$day.'日';
break;
default:
$wadate = $gengo.sprintf("%02d", $wayear).'年'.$month.'月'.$day.'日';
}
return $wadate;
}
function convJtGDate($src) {
$a = array('1', '2', '3', '4', '5', '6', '7', '8', '9', '0');
$g = mb_substr($src, 0, 2, 'UTF-8');
array_unshift($a, $g);
if (($g !== '明治' && $g !== '大正' && $g !== '昭和' && $g !== '平成'&& $g !== '令和')
|| (str_replace($a, '', $src) !== '年月日' && str_replace($a, '', $src) !== '元年月日')) return false;
$y = strtok(str_replace($g, '', $src), '年月日');
$m = strtok('年月日');
$d = strtok('年月日');
if (mb_strpos($src, '元年') !== false) $y = 1;
if ($g === '令和') $y += 2018;
elseif ($g === '平成') $y += 1988;
elseif ($g === '昭和') $y += 1925;
elseif ($g === '大正') $y += 1911;
elseif ($g === '明治') $y += 1868;
if (strlen($y) !== 4 || strlen($m) !== 2 || strlen($d) !== 2 || !@checkdate($m, $d, $y)) return false;
return $y.'/'.$m.'/'.$d;
}
//test
echo convGtJDate("2019/05/02").PHP_EOL;
echo convGtJDate("1981/12/02").PHP_EOL;
echo convGtJDate("1912/07/30").PHP_EOL;
echo convGtJDate("1927/05/16").PHP_EOL;
echo convGtJDate("1890/01/16").PHP_EOL;
var_dump(convGtJDate("1866/01/16"));
var_dump(convGtJDate("1866/01/"));
var_dump(convGtJDate("1890/1/16"));
var_dump(convGtJDate("2019/5/1"));
echo convJtGDate("昭和56年12月02日").PHP_EOL;
echo convJtGDate("大正元年07月30日").PHP_EOL;
echo convJtGDate("昭和02年05月16日").PHP_EOL;
echo convJtGDate("明治22年01月16日").PHP_EOL;
echo convJtGDate("令和22年01月16日").PHP_EOL;
var_dump(convJtGDate("昭和56年12月32日"));
var_dump(convJtGDate("平成12年11月2日"));
var_dump(convJtGDate("嘉永元年1月6日"));
var_dump(convJtGDate("明治11年11年11日"));
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