Index: wp-includes/taxonomy.php
===================================================================
--- wp-includes/taxonomy.php	(revision 23400)
+++ wp-includes/taxonomy.php	(working copy)
@@ -1242,7 +1242,7 @@
 	$key = md5( serialize( compact(array_keys($defaults)) ) . serialize( $taxonomies ) . $filter_key );
 	$last_changed = wp_cache_get( 'last_changed', 'terms' );
 	if ( ! $last_changed ) {
-		$last_changed = 1;
+		$last_changed = time();
 		wp_cache_set( 'last_changed', $last_changed, 'terms' );
 	}
 	$cache_key = "get_terms:$key:$last_changed";
@@ -2711,12 +2711,7 @@
 		do_action('clean_term_cache', $ids, $taxonomy);
 	}
 
-	if ( function_exists( 'wp_cache_incr' ) ) {
-		wp_cache_incr( 'last_changed', 1, 'terms' );
-	} else {
-		$last_changed = wp_cache_get( 'last_changed', 'terms' );
-		wp_cache_set( 'last_changed', $last_changed + 1, 'terms' );
-	}
+	wp_cache_set( 'last_changed', time(), 'terms' );
 }
 
 /**
Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 23400)
+++ wp-includes/post.php	(working copy)
@@ -3653,7 +3653,7 @@
 	$key = md5( serialize( compact(array_keys($defaults)) ) );
 	$last_changed = wp_cache_get( 'last_changed', 'posts' );
 	if ( ! $last_changed ) {
-		$last_changed = 1;
+		$last_changed = time();
 		wp_cache_set( 'last_changed', $last_changed, 'posts' );
 	}
 
@@ -4672,12 +4672,7 @@
 		do_action( 'clean_page_cache', $post->ID );
 	}
 
-	if ( function_exists( 'wp_cache_incr' ) ) {
-		wp_cache_incr( 'last_changed', 1, 'posts' );
-	} else {
-		$last_changed = wp_cache_get( 'last_changed', 'posts' );
-		wp_cache_set( 'last_changed', $last_changed + 1, 'posts' );
-	}
+	wp_cache_set( 'last_changed', time(), 'posts' );
 }
 
 /**
Index: wp-includes/comment.php
===================================================================
--- wp-includes/comment.php	(revision 23400)
+++ wp-includes/comment.php	(working copy)
@@ -251,7 +251,7 @@
 		$key = md5( serialize( compact(array_keys($defaults)) )  );
 		$last_changed = wp_cache_get( 'last_changed', 'comment' );
 		if ( ! $last_changed ) {
-			$last_changed = 1;
+			$last_changed = time();
 			wp_cache_set( 'last_changed', $last_changed, 'comment' );
 		}
 		$cache_key = "get_comments:$key:$last_changed";
@@ -1292,12 +1292,7 @@
 	$comment = get_comment($id);
 	do_action('wp_insert_comment', $id, $comment);
 
-	if ( function_exists( 'wp_cache_incr' ) ) {
-		wp_cache_incr( 'last_changed', 1, 'comment' );
-	} else {
-		$last_changed = wp_cache_get( 'last_changed', 'comment' );
-		wp_cache_set( 'last_changed', $last_changed + 1, 'comment' );
-	}
+	wp_cache_set( 'last_changed', time(), 'comment' );
 
 	return $id;
 }
@@ -2050,12 +2045,7 @@
 	foreach ( (array) $ids as $id )
 		wp_cache_delete($id, 'comment');
 
-	if ( function_exists( 'wp_cache_incr' ) ) {
-		wp_cache_incr( 'last_changed', 1, 'comment' );
-	} else {
-		$last_changed = wp_cache_get( 'last_changed', 'comment' );
-		wp_cache_set( 'last_changed', $last_changed + 1, 'comment' );
-	}
+	wp_cache_set( 'last_changed', time(), 'comment' );
 }
 
 /**
Index: wp-includes/general-template.php
===================================================================
--- wp-includes/general-template.php	(revision 23400)
+++ wp-includes/general-template.php	(working copy)
@@ -919,7 +919,7 @@
 
 	$last_changed = wp_cache_get( 'last_changed', 'posts' );
 	if ( ! $last_changed ) {
-		$last_changed = 1;
+		$last_changed = time();
 		wp_cache_set( 'last_changed', $last_changed, 'posts' );
 	}