diff --git a/owntracks/05-frontend-cm.yaml b/owntracks/05-frontend-cm.yaml
index 1b1ba28..d370c81 100644
--- a/owntracks/05-frontend-cm.yaml
+++ b/owntracks/05-frontend-cm.yaml
@@ -5,6 +5,9 @@ metadata:
 data:
   config.js: |
     // Here you can overwite the default configuration values
+    const startDateTime = new Date();
+    startDateTime.setHours(0, 0, 0, 0);
+    startDateTime.setDate(date.getDate() - 1);
     window.owntracks = window.owntracks || {};
     window.owntracks.config = {
       map: {
@@ -14,4 +17,5 @@ data:
         },
         zoom: 13,
       },
+      startDateTime,
     };