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 />';
    }