format('T');
return str_starts_with($offset, '-') || str_starts_with($offset, '+') ? 'UTC' . $offset : $offset;
}
function toTZ($dt, $tz, $format='Y-m-d H:i') {
$tz = new DateTimeZone($tz);
return $dt->setTimezone($tz)->format($format);
}
function setUserCookie($name, $value) {
setcookie($name, $value, time() + COOKIE_LIFETIME, '/');
$_COOKIE[$name] = $value;
}
$popTZ = [
'America/Los_Angeles', // PST/PDT
'America/New_York', // EST/EDT
'Europe/London', // BST/GMT
'Europe/Paris', // CEST/CET
'Asia/Dubai', // UTC+04 "UAE"
'Asia/Jakarta', // WIB
'Asia/Tokyo', // JST
'Australia/Sydney', // AEST/AEDT
'UTC'
];
$allTZ = timezone_identifiers_list(DateTimeZone::ALL);
// User sets timezone cookie
if (isset($_POST['user-tz']) && in_array($_POST['user-tz'], $allTZ)) {
setUserCookie('user-tz', $_POST['user-tz']);
}
// User sets 24 hours
if (isset($_POST['user-24'])) {
setUserCookie('user-24', '1');
}
// If had JS enabled but doesn't now, set has-js to 0
if (isset($_POST['no-js'])) {
setUserCookie('has-js', '0');
}
// Micro-routing
try {
if (isset($_POST['datetime']) && isset($_POST['timezone'])) {
// -- Redirect to submitted date
// @NOTE(Kody): I'm fine not validating all inputs here.
// Either it will fall in the catch block, or fail at the validation after the redirect.
// Handle if timezone is an offset
$postTZ = $_POST['timezone'];
if (is_numeric($_POST['timezone'])) {
$isNeg = str_starts_with($postTZ, '-');
$h = str_pad(abs(intdiv($postTZ, 60)), 2, '0', STR_PAD_LEFT);
$m = str_pad($postTZ % 60, 2, '0', STR_PAD_LEFT);
$postTZ = ($isNeg ? '-' : '+') . $h . $m;
}
// Make our date object
$dateObj = new DateTime($_POST['datetime'], new DateTimeZone($postTZ));
// Redirect, with the "+" replaced by "_"
header('Location: /' . str_replace('+', '_', $dateObj->format('c')));
exit;
} elseif ($_SERVER['REQUEST_URI'] !== '/') {
// -- Show date infos
// Remove leading "/"
$req = substr($_SERVER['REQUEST_URI'], 1);
// Check if date is following the format
$re = '/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}[\_|-]\d{2}:\d{2}$/';
if (!preg_match($re, $req)) {
http_response_code(404);
$error = 'Date is not valid, wrong format, or file not found.';
} else {
// Make our date object, convert back "_" to "+"
$dt = new DateTime(str_replace('_', '+', $req));
}
}
} catch (Exception $e) {
http_response_code(400);
$error = 'Date is not valid, or wrong format.';
}
?>
Time Zones Are Hard<?= isset($req) ? ' - ' . htmlspecialchars(str_replace('_', '+', $req), ENT_QUOTES, 'UTF-8') : '' ?>