--- a/client/src/lib/session.js	Fri Jul 06 10:51:19 2018 +0200
+++ b/client/src/lib/session.js	Fri Jul 06 11:04:52 2018 +0200
@@ -1,12 +1,12 @@
 function sessionStillActive(expiresFromPastSession) {
   if (!expiresFromPastSession) return false;
   const now = Date.now();
-  const sessionEnd =
-    typeof expiresFromPastSession === "string"
-      ? expiresFromPastSession * 1000
-      : expiresFromPastSession;
-  const stillActive = now < sessionEnd;
+  const stillActive = now < expiresFromPastSession;
   return stillActive;
 }
 
-export { sessionStillActive };
+function toMillisFromString(timestring) {
+  return timestring * 1000;
+}
+
+export { sessionStillActive, toMillisFromString };

--- a/client/src/router.js	Fri Jul 06 10:51:19 2018 +0200
+++ b/client/src/router.js	Fri Jul 06 11:04:52 2018 +0200
@@ -3,7 +3,7 @@
 import Login from "./views/Login.vue";
 import Main from "./views/Main.vue";
 import store from "./store";
-import { sessionStillActive } from "./lib/session";
+import { sessionStillActive, toMillisFromString } from "./lib/session";
 
 Vue.use(Router);
 
@@ -22,7 +22,9 @@
         requiresAuth: true
       },
       beforeEnter: (to, from, next) => {
-        const expiresFromPastSession = localStorage.getItem("expires");
+        const expiresFromPastSession = toMillisFromString(
+          localStorage.getItem("expires")
+        );
         if (sessionStillActive(expiresFromPastSession)) {
           store.commit("user/set_user", localStorage.getItem("user"));
           store.commit("user/set_expires", expiresFromPastSession);
@@ -44,7 +46,9 @@
 router.beforeEach((to, from, next) => {
   const requiresAuth = to.matched.some(record => record.meta.requiresAuth);
   const loggedIn = store.getters.authenticated;
-  const expiresFromPastSession = localStorage.getItem("expires");
+  const expiresFromPastSession = toMillisFromString(
+    localStorage.getItem("expires")
+  );
   const authRequired =
     requiresAuth && !(loggedIn || sessionStillActive(expiresFromPastSession));
   if (authRequired) {

--- a/client/tests/unit/session/session.spec.js	Fri Jul 06 10:51:19 2018 +0200
+++ b/client/tests/unit/session/session.spec.js	Fri Jul 06 11:04:52 2018 +0200
@@ -1,11 +1,14 @@
-import { sessionStillActive } from "../../../src/lib/session";
+import {
+  sessionStillActive,
+  toMillisFromString
+} from "../../../src/lib/session";
 
 test("No session counts as expired session", () => {
   expect(sessionStillActive(null)).toBe(false);
 });
 
 test("Session expired", () => {
-  const expired = Date.now() - 6000;
+  const expired = Date.now() - 60000;
   expect(sessionStillActive(expired)).toBe(false);
 });
 
@@ -15,11 +18,11 @@
 });
 
 test("Session alive with string", () => {
-  const active = "" + Date.now() + 60000;
-  expect(sessionStillActive(active)).toBe(true);
+  const active = "" + Date.now() / 1000 + 60000;
+  expect(sessionStillActive(toMillisFromString(active))).toBe(true);
 });
 
 test("Session expired with string", () => {
-  const expired = "" + Date.now() - 60000;
-  expect(sessionStillActive(expired)).toBe(false);
+  const expired = "" + Date.now() / 1000 - 60000;
+  expect(sessionStillActive(toMillisFromString(expired))).toBe(false);
 });