Implement default value for date-url-parameter

aleksis/apps/chronos/frontend/index.js

 import { hasPersonValidator } from "aleksis.core/routeValidators";
 import Timetable from "./components/Timetable.vue";
 import Substitutions from "./components/Substitutions.vue";
+import { DateTime } from "luxon";
 
 export default {
   meta: {
@@ -61,9 +62,18 @@ export default {
       },
     },
     {
-      path: "substitutions/:date/",
+      path: "substitutions/",
+      props: true,
       component: Substitutions,
-      name: "chronos.listSubstitutionsForDate",
+      name: "chronos.listSubstitutionsForDateLanding",
+      redirect: () => {
+        return {
+          name: "chronos.listSubstitutionsForDate",
+          params: {
+            date: DateTime.now().toISODate(),
+          },
+        };
+      },
       meta: {
         inMenu: true,
         titleKey: "chronos.substitutions.menu_title",
@@ -72,6 +82,18 @@ export default {
         permission: "chronos.view_substitutions_rule",
         fullWidth: true,
       },
+      children: [
+        {
+          path: ":date/",
+          component: Substitutions,
+          name: "chronos.listSubstitutionsForDate",
+          meta: {
+            toolbarTitle: "chronos.substitutions.menu_title",
+            permission: "chronos.view_substitutions_rule",
+            fullWidth: true,
+          },
+        },
+      ],
     },
   ],
 };