fetch: better checking for 1970- date

diff --git a/include/rssfuncs.php b/include/rssfuncs.php
index f806d4807596abbc463e1a14079d4a4d63377ee4..dbe76d2d377c2103f509b4d8b7a4a39f71a8ecf9 100644 (file)
--- a/include/rssfuncs.php
+++ b/include/rssfuncs.php
@@ -241,8 +241,7 @@
                $cache_filename = CACHE_DIR . "/simplepie/" . sha1($fetch_url) . ".feed";
 
                // Ignore cache if new feed or manual update.
-               $cache_age = ($no_cache || is_null($last_updated) || $last_updated == '1970-01-01 00:00:00') ?
-                       30 : get_feed_update_interval($feed) * 60;
+               $cache_age = ($no_cache || is_null($last_updated) || strpos($last_updated, '1970-01-01') === 0) ? 30 : get_feed_update_interval($feed) * 60;
 
                _debug("cache filename: $cache_filename exists: " . file_exists($cache_filename), $debug_enabled);
                _debug("cache age: $cache_age; no cache: $no_cache", $debug_enabled);