zoneinfo_generator.php

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<?php
        exit;

        define('ZONEINFO','/usr/share/zoneinfo');
        define('TZ_CONVERT','tz_convert');
        define('READLINK','readlink');

        chdir('../../..');
        
        include_once('include/inc.header.php');
        include_once('Services/Calendar/classes/class.ilCalendarUtil.php');
        
        foreach(ilCalendarUtil::_getShortTimeZoneList() as $tz_name => $tmp)
        {
                $name_underscore = str_replace('/','_',$tz_name);
                
                if(is_link(ZONEINFO.'/'.$tz_name))
                {
                        $name = exec(READLINK.' -f '.ZONEINFO.'/'.$tz_name);
                }
                else
                {
                        $name = ZONEINFO.'/'.$tz_name;
                }
                
                exec(TZ_CONVERT.' -o Services/Calendar/zoneinfo/'.$name_underscore.'.tmp'.' '.$name);
                
                $reader = fopen('Services/Calendar/zoneinfo/'.$name_underscore.'.tmp', 'r');
                $writer = fopen('Services/Calendar/zoneinfo/'.$name_underscore.'.ics', 'w');
                
                $counter = 0;
                while($line = fgets($reader))
                {
                        if(++$counter < 4)
                        {
                                continue;
                        }
                        if($counter == 5)
                        {
                                fputs($writer, 'TZID:'.$tz_name."\n");
                        }
                        else
                        {
                                if(substr($line,0,13) === 'END:VCALENDAR')
                                {
                                        break;
                                }
                                fputs($writer, $line);
                        }
                }
                
                fclose($reader);
                fclose($writer);
                unlink('Services/Calendar/zoneinfo/'.$name_underscore.'.tmp');

                #echo $name_underscore.' <br />';
        }
        
        
?>