diff --git a/frontend/src/components/WeatherDashboard.jsx b/frontend/src/components/WeatherDashboard.jsx
index 5f4c0be..768f8fc 100644
--- a/frontend/src/components/WeatherDashboard.jsx
+++ b/frontend/src/components/WeatherDashboard.jsx
@@ -34,23 +34,23 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
       const savedRange = localStorage.getItem('customTimeRange')
       if (savedRange) {
         const { start, end } = JSON.parse(savedRange)
-        setCustomStartDate(start)
-        setCustomEndDate(end)
+        setCustomStartDate(start.split('T')[0])
+        setCustomEndDate(end.split('T')[0])
       } else {
         // Setze Standardwerte (letzte 7 Tage)
         const end = new Date()
         const start = new Date(end.getTime() - 7 * 24 * 60 * 60 * 1000)
         
-        setCustomStartDate(format(start, "yyyy-MM-dd'T'HH:mm"))
-        setCustomEndDate(format(end, "yyyy-MM-dd'T'HH:mm"))
+        setCustomStartDate(format(start, 'yyyy-MM-dd'))
+        setCustomEndDate(format(end, 'yyyy-MM-dd'))
       }
     } catch (e) {
       // Bei Fehler: Standardwerte verwenden
       const end = new Date()
       const start = new Date(end.getTime() - 7 * 24 * 60 * 60 * 1000)
       
-      setCustomStartDate(format(start, "yyyy-MM-dd'T'HH:mm"))
-      setCustomEndDate(format(end, "yyyy-MM-dd'T'HH:mm"))
+      setCustomStartDate(format(start, 'yyyy-MM-dd'))
+      setCustomEndDate(format(end, 'yyyy-MM-dd'))
     }
     
     setCustomError('')
@@ -58,20 +58,15 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
   }
   
   const handleApplyCustomRange = () => {
-    // Validierung
-    const start = new Date(customStartDate)
-    const end = new Date(customEndDate)
-    
     if (!customStartDate || !customEndDate) {
-      setCustomError('Bitte Start- und Endzeit auswählen')
+      setCustomError('Bitte Start- und Enddatum auswählen')
       return
     }
     
-    const diffHours = (end - start) / (1000 * 60 * 60)
-    const diffDays = diffHours / 24
+    const diffDays = Math.floor((new Date(customEndDate) - new Date(customStartDate)) / (1000 * 60 * 60 * 24))
     
-    if (diffHours < 1) {
-      setCustomError('Endzeit muss mindestens 1 Stunde nach der Startzeit liegen')
+    if (diffDays < 0) {
+      setCustomError('Enddatum muss nach dem Startdatum liegen')
       return
     }
     
@@ -80,6 +75,9 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
       return
     }
     
+    const startStr = customStartDate + 'T00:00'
+    const endStr = customEndDate + 'T23:59'
+    
     // Zeitbereich im localStorage speichern
     try {
       localStorage.setItem('customTimeRange', JSON.stringify({
@@ -92,7 +90,7 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
     }
     
     // Anwenden
-    onTimeRangeChange('custom', { start: customStartDate, end: customEndDate })
+    onTimeRangeChange('custom', { start: startStr, end: endStr })
     setShowCustomRangeModal(false)
   }
   
@@ -927,9 +925,9 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
             
             <div className="modal-form">
               <div className="form-group">
-                <label htmlFor="startDate">Startzeit:</label>
+                <label htmlFor="startDate">Startdatum:</label>
                 <input
-                  type="datetime-local"
+                  type="date"
                   id="startDate"
                   value={customStartDate}
                   onChange={(e) => setCustomStartDate(e.target.value)}
@@ -937,9 +935,9 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
               </div>
               
               <div className="form-group">
-                <label htmlFor="endDate">Endzeit:</label>
+                <label htmlFor="endDate">Enddatum:</label>
                 <input
-                  type="datetime-local"
+                  type="date"
                   id="endDate"
                   value={customEndDate}
                   onChange={(e) => setCustomEndDate(e.target.value)}
@@ -951,7 +949,7 @@ const WeatherDashboard = ({ data, currentData = [], rainData = [], timeRange = '
               )}
               
               <div className="modal-info">
-                <p>• Endzeit muss mindestens 1 Stunde nach der Startzeit liegen</p>
+                <p>• Enddatum muss nach dem Startdatum liegen</p>
                 <p>• Maximaler Zeitraum: 1 Jahr (365 Tage)</p>
               </div>