tilderadio site. https://tilderadio.org
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$from = gmdate("Y-m-d\T00:00:00\Z",strtotime("today"));
$to = gmdate("Y-m-d\T00:00:00\Z",strtotime("today + 8 days"));
include 'schedule.php';
function ics_formatdate($date) {
return gmdate("Ymd\THis\Z", strtotime($date));
// ICS generation. Here be dragons.
// I created the file using a Python script and reverse-engineered it to figure this out.
// text/calendar MIME type for ICS files
header("Content-Type: text/calendar");
// It should download as a .ics file
header('Content-Disposition: attachment; filename="tilderadio.ics"');
// the iCalendar Validator throws a hissy fit if lines aren't CRLF terminated
// Header.
echo "VERSION:2.0".ICS_EOL;
echo "PRODID:tilderadio schedule".ICS_EOL;
echo "DTSTAMP:".ics_formatdate("now").ICS_EOL;
// A list of event IDs that we have on the calendar, to avoid duplication
$event_ids = array();
foreach ($schedule as $event) {
$id = strval($event["id"]).gmdate("DHis",strtotime($event["start"])).gmdate("DHis",strtotime($event["end"]));
if (!in_array($id,$event_ids)){
// The VEVENT structure's pretty easy to generate, especially since we're already in UTC.
// First, we need a creation date.
// Just go with now.
echo "DTSTAMP:".ics_formatdate("now").ICS_EOL;
// Next, the event start and end.
echo "DTEND:".ics_formatdate($event["end"]).ICS_EOL;
echo "DTSTART:".ics_formatdate($event["start"]).ICS_EOL;
// Next, the recurrence rule.
if ($event["title"]!="tomasino") {
// We assume the format is weekly. (tomasino is the only DJ to have requested any other frequency.)
} else {
// TTT only comes on the last Sunday of the month, 23:30:00 UTC to 01:00:00 UTC
if (gmdate("His",strtotime($event["start"]))=="233000" && gmdate("His",strtotime($event["end"]))=="010000") {
} else {
// his other shows are weekly though
// Next, the event title, or "summary" as the spec calls it.
echo "SUMMARY:DJ ".$event["title"].ICS_EOL;
// Finally, a unique ID for this event.
// To make absolutely certain we don't repeat the same event ID, I decided to use a SHA256 hash of the event structure.
echo "UID:";
echo hash("sha256",json_encode($event));
// to avoid the validator complaining about lines longer than 75 characters, split after the hash
echo ICS_EOL." ";
// Now finish the address UID
echo "@tilderadio.org".ICS_EOL;
// Finally, close the VEVENT structure.
// Next event?
// Finally, close out the VCALENDAR structure.