+ * Convert Twitter mobile date to the date format expected in a RSS document.
+ */
+ public static function twitterToRssDate($date) {
+ // Twitter uses relative timestamps in minutes for recent tweets.
+ if (preg_match('/^(\d+)m$/', $date, $matches)) {
+ $timestamp = strtotime("+" . $matches[1] . " min", time());
+ if (FALSE === $timestamp) {
+ $timestamp = 0;
+ }
+ }
+ else {
+ /*
+ * In case the time is specified put it after the date,
+ * to make it recognized by strptime().
+ */
+ if (preg_match('/(.*) - (.*)/', $date, $matches)) {
+ $date = $matches[2] . " " . $matches[1];
+ }
+
+ $timestamp = strtotime($date);
+ if (FALSE === $timestamp) {
+ $timestamp = 0;
+ }
+
+ /*
+ * The twitter mobile UI usually only specifies the month and the day, so
+ * strtotime($date) may interpret the date as being in the future.
+ *
+ * If the date is in the future it is probably in the same day but in the
+ * previous year.
+ */
+ if ($timestamp > time()) {
+ $timestamp = strtotime('-1 years', $timestamp);
+ }
+ }
+
+ return Tweeper::epochToRssDate($timestamp);
+ }
+
+ /**