/**
* Generate or convert a String or an Integer parameter into an ISO 8601 Date format.
*
* @access public
* @param Object date in seconds OR in convertible String Date (http://php.net/manual/en/function.strtotime.php)
* to convert in a ISO 8601 Date format: 'Y-m-d\TH:i:sZ'
* @return String
*/
public static function getISODate($date = NULL)
{
if (FeedValidator::isNull($date) == FALSE) {
if (strlen($date) >= 8 && !is_int($date)) {
if (FeedValidator::isValidDate($date)) {
return $date;
} else {
return FeedValidator::isNull(strtotime($date)) ? self::getISODate() : date(DateTime::ATOM, strtotime($date));
}
} else {
if (intval($date) > 0 && FeedValidator::isOnlyNumsChars($date)) {
return date(DateTime::ATOM, $date);
}
}
} else {
$datetime_template = 'Y-m-d\\TH:i:s';
// control if PHP is configured with the same timezone then the server
$timezone_server = exec('date +%:z');
$timezone_php = date('P');
if (strlen($timezone_server) > 0 && $timezone_php != $timezone_server) {
return date($datetime_template, exec("date --date='@" . date('U') . "'")) . $timezone_server;
} else {
if (date_default_timezone_get() == 'UTC') {
$offsetString = 'Z';
} else {
$phpTime = date($datetime_template);
$millis = strtotime($phpTime);
// Convert time to milliseconds since 1970, using default timezone
$timezone = new DateTimeZone(date_default_timezone_get());
// Get default system timezone to create a new DateTimeZone object
$offset = $timezone->getOffset(new DateTime($phpTime));
// Offset in seconds to UTC
$offsetHours = round(abs($offset) / 3600);
$offsetMinutes = round((abs($offset) - $offsetHours * 3600) / 60);
$offsetString = ($offset < 0 ? '-' : '+') . ($offsetHours < 10 ? '0' : '') . $offsetHours . ':' . ($offsetMinutes < 10 ? '0' : '') . $offsetMinutes;
}
return date($datetime_template, $millis) . $offsetString;
}
}
return addslashes(date(DateTime::ATOM, date('U')));
}
