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Is there an existing issue for this?

• I have searched the existing issues

Version

10.0.18

Bug description

The ICS export generated by GLPI planning misses recurrence data :

• No RRULE is written, so a recurring event is exported as a single occurrence.
• EXDATE lines (date exceptions) are also absent.

Relevant log output

Page URL

No response

Steps To reproduce

Steps to reproduce

• Create a recurring planning event (e.g., weekly, every 3 weeks).
• Optionally add one or more exception dates.
• Export the calendar via Export → Ical.
• Open the downloaded .ics: the VEVENT block has no RRULE or EXDATE.

Your GLPI setup information

No response

Anything else?

Quick fix that works for me

Edit src/Planning.php, method generateIcal().
Right after you finish building $vevent and just before you call
$vcalendar->add('VEVENT', $vevent); add :

line 2748

// RRULE
if (!empty($val['rrule'])) {
    $parts = [];
    foreach ($val['rrule'] as $k => $v) {

        if ($v === '' || $v === null) {
            continue;
        }

        // EXDATE
        if ($k === 'exceptions') {
            $exceptions = array_unique($v);
            $exceptions = array_map(
                static fn ($date) => str_replace('-', '', $date),
                $exceptions
            );
            $vevent['EXDATE;VALUE=DATE'] = $exceptions;
            continue;
        }

        if ($k === 'until') {
            $v = str_replace('-', '', $v);
        }

        $parts[] = strtoupper($k) . '=' . strtoupper($v);
    }
    if ($parts) {
        $vevent['RRULE'] = implode(';', $parts);
    }
}