function timezones_from_countryCode($country_code, $country_name)
{
$dt = new DateTime();
// create a list of timezones based on that country code..
$timezones = DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, $country_code);
$timezone_offset = [];
// instantiate timezone_offset array
foreach ($timezones as $timezone) {
$tz = new DateTimeZone($timezone);
$timezone_offset[$timezone] = $tz->getOffset(new DateTime());
}
// sort by offset
asort($timezone_offset);
// format display of timezone and offset
foreach ($timezone_offset as $raw_timezone => $offset) {
$dt->setTimezone(new DateTimeZone($raw_timezone));
$timezone_abbr = $dt->format('T');
$offset_prefix = $offset < 0 ? '-' : '+';
$offset_formatted = gmdate('H:i', abs($offset));
$pretty_offset = "UTC{$offset_prefix}{$offset_formatted}";
// if( ($pos = strpos($raw_timezone, '/') ) !== false ) { // remove 'America/'
// $clean_timezone = substr($raw_timezone, $pos+1);
// if( ($pos = strpos($clean_timezone, '/')) !== false ) { // remove second level '.../'
// $clean_timezone = substr($clean_timezone, $pos+1);
// }
// }
// $clean_timezone = str_replace('_',' ',$clean_timezone); // remove the '_' in city names
$clean_timezone = User::clean_city($raw_timezone);
echo "<option value=\"{$raw_timezone}\">(" . $pretty_offset . ") " . $clean_timezone . ' (' . $timezone_abbr . ')</option>';
}
}