/home/smartonegroup/public_html/system/system/autoload/Timezone.php
<?php
class Timezone
{
public static function timezoneList()
{
$timezoneIdentifiers = DateTimeZone::listIdentifiers();
$utcTime = new DateTime('now', new DateTimeZone('UTC'));
$tempTimezones = [];
foreach ($timezoneIdentifiers as $timezoneIdentifier) {
$currentTimezone = new DateTimeZone($timezoneIdentifier);
$tempTimezones[] = [
'offset' => (int) $currentTimezone->getOffset($utcTime),
'identifier' => $timezoneIdentifier,
];
}
// Sort the array by offset,identifier ascending
usort($tempTimezones, function ($a, $b) {
return $a['offset'] === $b['offset']
? strcmp($a['identifier'], $b['identifier'])
: $a['offset'] - $b['offset'];
});
$timezoneList = [];
foreach ($tempTimezones as $tz) {
$sign = $tz['offset'] > 0 ? '+' : '-';
$offset = gmdate('H:i', abs($tz['offset']));
$timezoneList[$tz['identifier']] =
'(UTC ' . $sign . $offset . ') ' . $tz['identifier'];
}
return $timezoneList;
}
}