diff --git a/html/js/office-render.js b/html/js/office-render.js
index f8e94d1..a875d6b 100644
--- a/html/js/office-render.js
+++ b/html/js/office-render.js
@@ -23,6 +23,7 @@ import {
   formatEventLineText,
   truncateToWidth,
   buildEventModalContent,
+  filterEventsForToday,
   buildSystemModalContent,
   buildKpiTiles,
   buildKpiModalContent,
@@ -2386,7 +2387,7 @@ export function renderOfficeScene(container, data = {}) {
   }
 
   const wallGroup = renderMonitorWall(systems, events, displayKpis, {
-    onEventsClick: () => openModal(buildEventModalContent(events), renderEventModalBody),
+    onEventsClick: () => openModal(buildEventModalContent(filterEventsForToday(events)), renderEventModalBody),
     onSystemsClick: () => openModal(buildSystemModalContent(systems), renderSystemModalBody),
     // Issue #70: die aktuell gezeigten Systeme wandern mit ins Modal - daran erkennt es,
     // welche Kacheln zu keinem konfigurierten Host mehr gehoeren.
diff --git a/html/js/office-scene.js b/html/js/office-scene.js
index df6c6b7..928f4c2 100644
--- a/html/js/office-scene.js
+++ b/html/js/office-scene.js
@@ -335,7 +335,31 @@ export function truncateToWidth(value, availableWidth, charWidth = EVENT_LINE_CH
 }
 
 /**
- * Inhaltsmodell fuer das Event-Monitor-Modal: volle Liste (kein MAX_EVENT_LINES-Limit).
+ * Filtert Events auf den aktuellen Kalendertag (Issue #100: die volle Eventliste im Modal
+ * lief sonst unbegrenzt zurueck und wurde dadurch unuebersichtlich lang). "Aktueller Tag"
+ * meint wie bei formatEventTime() die lokale Zeitzone des Browsers (F16), nicht UTC.
+ *
+ * @param {Array<{occurred_at: string}>} events
+ * @param {Date} [now]
+ * @returns {Array<object>}
+ */
+export function filterEventsForToday(events = [], now = new Date()) {
+  return events.filter((event) => {
+    const occurredAt = new Date(event.occurred_at);
+    if (Number.isNaN(occurredAt.getTime())) {
+      return false;
+    }
+    return (
+      occurredAt.getFullYear() === now.getFullYear() &&
+      occurredAt.getMonth() === now.getMonth() &&
+      occurredAt.getDate() === now.getDate()
+    );
+  });
+}
+
+/**
+ * Inhaltsmodell fuer das Event-Monitor-Modal: volle Liste des aktuellen Tages (kein
+ * MAX_EVENT_LINES-Limit, aber auf heute gefiltert, siehe filterEventsForToday()).
  *
  * @param {Array<object>} events
  */
diff --git a/tests/frontend/office-scene.test.js b/tests/frontend/office-scene.test.js
index 663f219..513c2c8 100644
--- a/tests/frontend/office-scene.test.js
+++ b/tests/frontend/office-scene.test.js
@@ -19,6 +19,7 @@ import {
   truncateToWidth,
   EVENT_LINE_CHAR_WIDTH,
   buildEventModalContent,
+  filterEventsForToday,
   buildSystemModalContent,
   systemsWithoutHostConfig,
   formatSystemCheckTime,
@@ -350,6 +351,28 @@ test("buildEventModalContent zeigt die volle Liste (kein MAX_EVENT_LINES-Limit)"
   assert.equal(content.items[0].systemId, "srv1");
 });
 
+test("filterEventsForToday behaelt nur Events vom aktuellen Kalendertag (lokale Zeitzone, F16)", () => {
+  const now = new Date("2026-07-27T10:00:00");
+  const events = [
+    { id: "heute-frueh", occurred_at: "2026-07-27T00:05:00" },
+    { id: "heute-spaet", occurred_at: "2026-07-27T23:55:00" },
+    { id: "gestern", occurred_at: "2026-07-26T23:59:00" },
+    { id: "morgen", occurred_at: "2026-07-28T00:00:00" },
+    { id: "ungueltig", occurred_at: "nicht-valide" },
+  ];
+  const filtered = filterEventsForToday(events, now);
+  assert.deepEqual(
+    filtered.map((e) => e.id),
+    ["heute-frueh", "heute-spaet"]
+  );
+});
+
+test("filterEventsForToday liefert eine leere Liste, wenn kein Event von heute ist", () => {
+  const now = new Date("2026-07-27T10:00:00");
+  const events = [{ id: "gestern", occurred_at: "2026-07-26T10:00:00" }];
+  assert.deepEqual(filterEventsForToday(events, now), []);
+});
+
 test("buildSystemModalContent uebernimmt Status/Detail je System", () => {
   const content = buildSystemModalContent([
     { id: "srv1", name: "Webserver", status: "ok", type: "host", detail: null, last_check_at: "t" },