Fix last-modified

Author: Ivan Kalinin

index.js

@@ -18,8 +18,8 @@ module.exports = {
 		}, function (err, result) {
 
 			if (!err && result) {
-				var ifModifiedSince = Date.parse(req.headers['if-modified-since']);
-				var lastModified = Date.parse(result['LastModified']);
+				var ifModifiedSince = new Date(req.headers['if-modified-since']);
+				var lastModified = new Date(result['LastModified']);
 				var now = Date.now();
 
 				if ('LastModified' in result) {