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<?php
// Set timezone
date_default_timezone_set("PRC");

// Print current time  PHP_EOL for line break, compatible with different systems
echo date("Y-m-d H:i:s")  . PHP_EOL;
echo date("Y年m月d日H点i分s秒")  . PHP_EOL;
// Specify time
$time = strtotime("2018-01-18 08:08:08");  // Convert specified date to timestamp
echo date("Y-m-d H:i:s", $time)  . PHP_EOL;
?>

2018-01-31 22:09:35
2018年01月31日22点09分35秒
2018-01-18 08:08:08