move timestamp to server

public/src/client/topic/diffs.js

@@ -15,8 +15,6 @@ define('forum/topic/diffs', ['forum/topic/images', 'benchpress', 'translator'],
 				return app.alertError(err.message);
 			}
 
-			timestamps.unshift(Date.now());
-
 			Benchpress.parse('partials/modals/post_history', {
 				diffs: timestamps.map(function (timestamp) {
 					timestamp = parseInt(timestamp, 10);

src/socket.io/posts/diffs.js

@@ -1,10 +1,19 @@
 'use strict';
 
+var async = require('async');
 var posts = require('../../posts');
 
 module.exports = function (SocketPosts) {
 	SocketPosts.getDiffs = function (socket, data, callback) {
-		posts.diffs.list(data.pid, callback);
+		async.waterfall([
+			function (next) {
+				posts.diffs.list(data.pid, next);
+			},
+			function (timestamps, next) {
+				timestamps.unshift(Date.now());
+				next(null, timestamps);
+			},
+		], callback);
 	};
 
 	SocketPosts.showPostAt = function (socket, data, callback) {