Deprecated: Return type of Joomla\CMS\Date\Date::format($format, $local = false, $translate = true) should either be compatible with DateTime::format(string $format): string, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /is/htdocs/wp11110944_QQ8NPOTXXL/www/foerderverein/libraries/src/Date/Date.php on line 281

Deprecated: Return type of Joomla\CMS\Date\Date::setTimezone($tz) should either be compatible with DateTime::setTimezone(DateTimeZone $timezone): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /is/htdocs/wp11110944_QQ8NPOTXXL/www/foerderverein/libraries/src/Date/Date.php on line 398
Error: Failed to start application: Failed to start the session because headers have already been sent by "/is/htdocs/wp11110944_QQ8NPOTXXL/www/foerderverein/libraries/src/Date/Date.php" at line 37.