TimezoneFilter.php

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<?php
namespace MediaWiki\Preferences;
 
use MediaWiki\User\UserTimeCorrection;
 
class TimezoneFilter implements Filter {
 
    public function filterForForm( $value ) {
        return $value;
    }
 
    public function filterFromForm( $tz ) {
        if ( $tz === UserTimeCorrection::SYSTEM ) {
            return $tz;
        }
        return ( new UserTimeCorrection( $tz ) )->toString();
    }
}