diff --git a/PROJECT_STATUS.md b/PROJECT_STATUS.md
index a841e07..496f667 100644
--- a/PROJECT_STATUS.md
+++ b/PROJECT_STATUS.md
@@ -71,6 +71,8 @@ ventana de procesamiento en vez de bloquear un segundo por sensor.
 - Valores permitidos: 7, 30, 90, 365 o 0 para retencion indefinida.
 - La poda conserva los nombres actuales de archivos para no romper graficas ni
   exportaciones.
+- Las graficas filtran visualmente el dia actual; los CSV mantienen todos los
+  registros disponibles dentro de la retencion configurada.
 
 ## Notificaciones
 
diff --git a/README.md b/README.md
index f99609d..7ab8ada 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,10 @@ expone en `GET /api/alarms`. Se registran entradas a `WARNING`, `CRITICAL` y
 90, 365 o 0 para conservar indefinidamente. El recolector poda filas antiguas de
 CSV sin cambiar los nombres que usa el dashboard.
 
+Las graficas del dashboard muestran solo los datos del dia actual para evitar
+saturacion visual. Los CSV conservan el periodo completo configurado por
+retencion y siguen disponibles para exportacion.
+
 ## Umbrales de alarma
 
 Los limites se guardan en `config/alarms.json`, se consultan con
diff --git a/frontend/dashboard.js b/frontend/dashboard.js
index 20f9bd4..0103e7e 100644
--- a/frontend/dashboard.js
+++ b/frontend/dashboard.js
@@ -1,6 +1,7 @@
 const POLLING_INTERVAL_MS = 1000;
 const WARNING_MARGIN_RATIO = 0.1;
 const MIN_READING_MAX_AGE_MS = 15000;
+const DAY_IN_MS = 24 * 60 * 60 * 1000;
 
 // Variables dinámicas para el control de históricos
 let currentHistoryInterval = 10000;
@@ -718,6 +719,7 @@ function parseHistoricalCsv(csvText, valueKey) {
     return rows
         .map((line) => splitCsvLine(line))
         .map((columns) => {
+            const rawTimestamp = columns[timestampIndex];
             const rawValue = Number(columns[valueIndex]);
 
             if (!Number.isFinite(rawValue)) {
@@ -725,13 +727,49 @@ function parseHistoricalCsv(csvText, valueKey) {
             }
 
             return {
-                label: formatTimestamp(columns[timestampIndex]),
+                timestampMs: parseTimestampMs(rawTimestamp),
+                label: formatTimestamp(rawTimestamp),
                 value: rawValue
             };
         })
         .filter(Boolean);
 }
 
+function parseTimestampMs(rawTimestamp) {
+    const numericTimestamp = Number(rawTimestamp);
+
+    if (Number.isFinite(numericTimestamp)) {
+        if (numericTimestamp > 1000000000000) {
+            return numericTimestamp;
+        }
+
+        if (numericTimestamp > 1000000000) {
+            return numericTimestamp * 1000;
+        }
+    }
+
+    const parsedDate = new Date(rawTimestamp);
+
+    if (!Number.isNaN(parsedDate.getTime())) {
+        return parsedDate.getTime();
+    }
+
+    return Number.NaN;
+}
+
+function filterPointsForCurrentDay(points) {
+    const startOfToday = new Date();
+    startOfToday.setHours(0, 0, 0, 0);
+    const startMs = startOfToday.getTime();
+    const endMs = startMs + DAY_IN_MS;
+
+    return points.filter((point) =>
+        Number.isFinite(point.timestampMs) &&
+        point.timestampMs >= startMs &&
+        point.timestampMs < endMs
+    );
+}
+
 function splitCsvLine(line) {
     return line
         .split(",")
@@ -755,22 +793,10 @@ function formatTimestamp(rawTimestamp) {
         return "";
     }
 
-    const numericTimestamp = Number(rawTimestamp);
-
-    if (Number.isFinite(numericTimestamp)) {
-        if (numericTimestamp > 1000000000000) {
-            return new Date(numericTimestamp).toLocaleTimeString();
-        }
-
-        if (numericTimestamp > 1000000000) {
-            return new Date(numericTimestamp * 1000).toLocaleTimeString();
-        }
-    }
-
-    const parsedDate = new Date(rawTimestamp);
+    const parsedMs = parseTimestampMs(rawTimestamp);
 
-    if (!Number.isNaN(parsedDate.getTime())) {
-        return parsedDate.toLocaleTimeString();
+    if (Number.isFinite(parsedMs)) {
+        return new Date(parsedMs).toLocaleTimeString();
     }
 
     return rawTimestamp;
@@ -893,7 +919,7 @@ async function updateHistoricalTrends() {
         historicalCharts.map(async (chartConfig) => ({
             chartConfig,
             points: currentEnabledSensorIds.has(chartConfig.sensorId)
-                ? await readHistoricalData(chartConfig)
+                ? filterPointsForCurrentDay(await readHistoricalData(chartConfig))
                 : []
         }))
     );
diff --git a/frontend/index.html b/frontend/index.html
index b6f06ee..8e47bd0 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -145,7 +145,7 @@
         <section class="trends-panel" aria-label="Tendencias históricas">
             <div class="panel-heading">
                 <h2>Tendencias Históricas</h2>
-                <p>Actualización: <span id="history-interval">10 segundos</span></p>
+                <p>Periodo visible: hoy · Actualización: <span id="history-interval">10 segundos</span></p>
             </div>
             <div class="card config-card" style="margin-bottom: 20px; padding: 20px; border-left: 4px solid #9c27b0;">
                 <h3>Configuración de Almacenamiento</h3>
diff --git a/test/static.test.js b/test/static.test.js
index c737e76..570d6ae 100644
--- a/test/static.test.js
+++ b/test/static.test.js
@@ -32,6 +32,7 @@ test('dashboard starts live polling and exposes required controls', () => {
     assert.match(dashboard, /saveNotificationConfig/);
     assert.match(dashboard, /\/api\/config\/notifications/);
     assert.match(dashboard, /getApiHeaders/);
+    assert.match(dashboard, /filterPointsForCurrentDay/);
     assert.match(
         dashboard,
         /setInterval\(updateDashboard,\s*POLLING_INTERVAL_MS\)/