+if(! function_exists('feed_birthday')) {
+function feed_birthday($uid,$tz) {
+
+ /**
+ *
+ * Determine the next birthday, but only if the birthday is published
+ * in the default profile. We _could_ also look for a private profile that the
+ * recipient can see, but somebody could get mad at us if they start getting
+ * public birthday greetings when they haven't made this info public.
+ *
+ * Assuming we are able to publish this info, we are then going to convert
+ * the start time from the owner's timezone to UTC.
+ *
+ * This will potentially solve the problem found with some social networks
+ * where birthdays are converted to the viewer's timezone and salutations from
+ * elsewhere in the world show up on the wrong day. We will convert it to the
+ * viewer's timezone also, but first we are going to convert it from the birthday
+ * person's timezone to GMT - so the viewer may find the birthday starting at
+ * 6:00PM the day before, but that will correspond to midnight to the birthday person.
+ *
+ */
+
+ $birthday = '';
+
+ $p = q("SELECT `dob` FROM `profile` WHERE `is-default` = 1 AND `uid` = %d LIMIT 1",
+ intval($uid)
+ );
+
+ if($p && count($p)) {
+ $tmp_dob = substr($p[0]['dob'],5);
+ if(intval($tmp_dob)) {
+ $y = datetime_convert($tz,$tz,'now','Y');
+ $bd = $y . '-' . $tmp_dob . ' 00:00';
+ $t_dob = strtotime($bd);
+ $now = strtotime(datetime_convert($tz,$tz,'now'));
+ if($t_dob < $now)
+ $bd = $y + 1 . '-' . $tmp_dob . ' 00:00';
+ $birthday = datetime_convert($tz,'UTC',$bd,ATOM_TIME);
+ }
+ }
+
+ return $birthday;
+}}
+
+/**
+ * return atom link elements for all of our hubs
+ */
+
+if(! function_exists('feed_hublinks')) {
+function feed_hublinks() {
+
+ $hub = get_config('system','huburl');
+
+ $hubxml = '';
+ if(strlen($hub)) {
+ $hubs = explode(',', $hub);
+ if(count($hubs)) {
+ foreach($hubs as $h) {
+ $h = trim($h);
+ if(! strlen($h))
+ continue;
+ $hubxml .= '<link rel="hub" href="' . xmlify($h) . '" />' . "\n" ;
+ }
+ }
+ }
+ return $hubxml;
+}}
+
+/* return atom link elements for salmon endpoints */
+
+if(! function_exists('feed_salmonlinks')) {
+function feed_salmonlinks($nick) {