diff --ignore-all-space -ru typo3_src_trunk_orig/t3lib/cache/backend/class.t3lib_cache_backend_apcbackend.php typo3_src_trunk/t3lib/cache/backend/class.t3lib_cache_backend_apcbackend.php
--- typo3_src_trunk_orig/t3lib/cache/backend/class.t3lib_cache_backend_apcbackend.php	2009-10-21 13:50:29.000000000 +0400
+++ typo3_src_trunk/t3lib/cache/backend/class.t3lib_cache_backend_apcbackend.php	2009-10-21 14:12:41.000000000 +0400
@@ -81,9 +81,6 @@
 	/**
 	 * Saves data in the cache.
 	 *
-	 * Note on lifetime: the number of seconds may not exceed 2592000 (30 days),
-	 * otherwise it is interpreted as a UNIX timestamp (seconds since epoch).
-	 *
 	 * @param string $entryIdentifier An identifier for this specific cache entry
 	 * @param string $data The data to be stored
 	 * @param array $tags Tags to associate with this cache entry
diff --ignore-all-space -ru typo3_src_trunk_orig/t3lib/cache/backend/class.t3lib_cache_backend_memcachedbackend.php typo3_src_trunk/t3lib/cache/backend/class.t3lib_cache_backend_memcachedbackend.php
--- typo3_src_trunk_orig/t3lib/cache/backend/class.t3lib_cache_backend_memcachedbackend.php	2009-10-21 13:50:29.000000000 +0400
+++ typo3_src_trunk/t3lib/cache/backend/class.t3lib_cache_backend_memcachedbackend.php	2009-10-21 14:12:44.000000000 +0400
@@ -224,6 +224,12 @@
 		$tags[] = '%MEMCACHEBE%' . $this->cache->getIdentifier();
 		$expiration = $lifetime !== NULL ? $lifetime : $this->defaultLifetime;
 
+			// Memcached consideres values over 2592000 sec (30 days) as UNIX timestamp
+			// thus $expiration should be converted from lifetime to UNIX timestamp
+		if ($expiration > 2592000) {
+			$expiration += $GLOBALS['EXEC_TIME'];
+		}
+
 		try {
 			if(strlen($data) > self::MAX_BUCKET_SIZE) {
 				$data = str_split($data, 1024 * 1000);