- var_dump: documentation ( source)
- date_default_timezone_get: documentation ( source)
<?php
var_dump(date_default_timezone_get());
for ($y = 1970; $y <= 2020; $y++) {
$dt = DateTime::createFromFormat("Y", $y);
$date = $dt->format("Y-m-d H:i:s");
$isL = $dt->format("L");
print "$y :: $date :: $isL\n";
}