format('Y');
$month_n = (int)$today->format('n');
$end_year = ($month_n == 12) ? $year + 1 : $year;
$default_start = $today->format('Y-m-d');
$default_end = $end_year . '-12-31';
$start_date = isset($_GET['start']) && $_GET['start'] !== '' ? trim($_GET['start']) : $default_start;
$end_date = isset($_GET['end']) && $_GET['end'] !== '' ? trim($_GET['end']) : $default_end;
if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $start_date)) $start_date = $default_start;
if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $end_date)) $end_date = $default_end;
/* ---------------------------------------------------------------
Calendar month for calendar view
--------------------------------------------------------------- */
$cal_month_raw = isset($_GET['month']) ? trim($_GET['month']) : $today->format('Y-m');
if (!preg_match('/^\d{4}-\d{2}$/', $cal_month_raw)) {
$cal_month_raw = $today->format('Y-m');
}
$cal_month = $cal_month_raw;
$cal_dt = new DateTime($cal_month . '-01');
$prev_dt = clone $cal_dt; $prev_dt->modify('-1 month');
$next_dt = clone $cal_dt; $next_dt->modify('+1 month');
$prev_month = $prev_dt->format('Y-m');
$next_month = $next_dt->format('Y-m');
/* ---------------------------------------------------------------
Series filter
--------------------------------------------------------------- */
if (isset($_GET['series'])) {
$filter_series = (int)$_GET['series'];
} elseif (!isset($_GET['start']) && !isset($_GET['month'])) {
$filter_series = $default_sid; // first visit: default to Theory/Experimental
} else {
$filter_series = 0;
}
/* ---------------------------------------------------------------
Fetch seminars
--------------------------------------------------------------- */
if ($view === 'calendar') {
$range_start = $cal_month . '-01';
$range_end = $cal_dt->format('Y-m-t');
} else {
$range_start = $start_date;
$range_end = $end_date;
}
if ($filter_series > 0) {
$stmt = $db->prepare(
"SELECT s.*, ss.name AS series_name
FROM seminars s
LEFT JOIN seminar_series ss ON ss.id = s.series_id
WHERE s.seminar_date >= ? AND s.seminar_date <= ?
AND s.series_id = ?
AND s.visible = 1
ORDER BY s.seminar_date ASC"
);
$stmt->execute(array($range_start, $range_end, $filter_series));
} else {
$stmt = $db->prepare(
"SELECT s.*, ss.name AS series_name
FROM seminars s
LEFT JOIN seminar_series ss ON ss.id = s.series_id
WHERE s.seminar_date >= ? AND s.seminar_date <= ?
AND s.visible = 1
ORDER BY s.seminar_date ASC"
);
$stmt->execute(array($range_start, $range_end));
}
$seminars = $stmt->fetchAll();
// Index by day-of-month for calendar view
$by_day = array();
if ($view === 'calendar') {
foreach ($seminars as $s) {
$day = (int)(new DateTime($s['seminar_date']))->format('j');
$by_day[$day][] = $s;
}
}
/* ---------------------------------------------------------------
ICS link (preserves series filter)
--------------------------------------------------------------- */
$ics_url = '/seminars/seminars.ics.php' . ($filter_series > 0 ? '?series=' . $filter_series : '');
$extra_head = '';
page_start('Seminar Calendar', $extra_head);
page_heading('Seminar Calendar', 'All scheduled visitor talks. Click a name to view the schedule.');
?>
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
format('w'); // 0=Sun
$days_in_month = (int)$cal_dt->format('t');
$today_day = (date('Y-m') === $cal_month) ? (int)date('j') : -1;
$cell = 0;
echo '';
// Leading empty cells
for ($i = 0; $i < $first_dow; $i++) {
echo ' | ';
$cell++;
}
// Day cells
for ($day = 1; $day <= $days_in_month; $day++) {
if ($cell > 0 && $cell % 7 === 0) echo '
';
$is_today = ($day === $today_day);
echo '| ';
echo ' ';
if ($is_today) {
echo '' . $day . '';
} else {
echo $day;
}
echo ' ';
if (isset($by_day[$day])) {
foreach ($by_day[$day] as $s) {
$status = seminar_status($s);
$ev_class = ($status === 'finalized') ? 'cal-event ev-finalized' : 'cal-event';
echo '';
}
}
echo ' | ';
$cell++;
}
// Trailing empty cells
while ($cell % 7 !== 0) {
echo ' | ';
$cell++;
}
echo '
';
?>
Showing visit
between
and .
📅 Subscribe to this calendar —
right-click the link and copy the URL, then use “Subscribe to calendar” in
Apple Calendar, Google Calendar, or Outlook to keep it updated automatically.
Or click the link to do a one-time import.