zoneinfo_generator.php

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<?php

    exit;

const ZONEINFO = '/usr/share/zoneinfo';
const TZ_CONVERT = 'tz_convert';
const READLINK = 'readlink';

    chdir('../../..');


    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 />';
    }