diff --git a/src/components/TicketCard.jsx b/src/components/TicketCard.jsx
index 5e1235a..4d6d085 100644
--- a/src/components/TicketCard.jsx
+++ b/src/components/TicketCard.jsx
@@ -8,6 +8,7 @@ import EditorDropdown from './EditorDropdown'
 import CreateWorksheetModal from './CreateWorksheetModal'
 import StatusHistoryModal from './StatusHistoryModal'
 import WorksheetList from './WorksheetList'
+import WorksheetTimesModal from './WorksheetTimesModal'
 import WorksheetStats from './WorksheetStats'
 import TicketAssignedProjectsPanel from './TicketAssignedProjectsPanel'
 import TicketProjectsModal from './TicketProjectsModal'
@@ -19,6 +20,7 @@ import Tabs from './ui/Tabs'
 import Badge from './ui/Badge'
 import { StatusPill, PriorityPill } from './ui/StatusPill'
 import { useWorksheets } from '../hooks/useWorksheets'
+import { useAuth } from '../context/AuthContext'
 import { databases, DATABASE_ID, COLLECTIONS } from '../lib/appwrite'
 import { serviceTypeLabel } from '../lib/ticketForm'
 
@@ -31,14 +33,16 @@ const TABS = [
 ]
 
 export default function TicketCard({ ticket, onUpdate }) {
+  const { user } = useAuth()
   const [expanded, setExpanded] = useState(false)
   const [activeTab, setActiveTab] = useState('details')
   const [showCreateWorksheet, setShowCreateWorksheet] = useState(false)
+  const [editTimesWorksheet, setEditTimesWorksheet] = useState(null)
   const [showHistoryModal, setShowHistoryModal] = useState(false)
   const [showProjectsModal, setShowProjectsModal] = useState(false)
   const [projectsRefreshKey, setProjectsRefreshKey] = useState(0)
 
-  const { worksheets, loading: worksheetsLoading, createWorksheet, getTotalTime } = useWorksheets(
+  const { worksheets, loading: worksheetsLoading, createWorksheet, updateWorksheetTimes, getTotalTime } = useWorksheets(
     expanded ? ticket.woid : null
   )
 
@@ -140,7 +144,13 @@ export default function TicketCard({ ticket, onUpdate }) {
                     <WorksheetStats worksheets={worksheets} />
                   </div>
                 )}
-                <WorksheetList worksheets={worksheets} totalTime={getTotalTime()} loading={worksheetsLoading} />
+                <WorksheetList
+                  worksheets={worksheets}
+                  totalTime={getTotalTime()}
+                  loading={worksheetsLoading}
+                  currentUser={user}
+                  onEditTimes={setEditTimesWorksheet}
+                />
               </div>
             )}
 
@@ -160,6 +170,13 @@ export default function TicketCard({ ticket, onUpdate }) {
       )}
 
       <CreateWorksheetModal isOpen={showCreateWorksheet} onClose={() => setShowCreateWorksheet(false)} workorder={ticket} onCreate={handleCreateWorksheet} />
+      {editTimesWorksheet && (
+        <WorksheetTimesModal
+          worksheet={editTimesWorksheet}
+          onClose={() => setEditTimesWorksheet(null)}
+          onSave={(ws, times) => updateWorksheetTimes(ws, times, user)}
+        />
+      )}
       <StatusHistoryModal isOpen={showHistoryModal} onClose={() => setShowHistoryModal(false)} worksheets={worksheets} ticket={ticket} />
       <TicketProjectsModal isOpen={showProjectsModal} onClose={() => setShowProjectsModal(false)} ticket={ticket} onUpdated={() => setProjectsRefreshKey((k) => k + 1)} />
     </div>
diff --git a/src/components/WorksheetList.jsx b/src/components/WorksheetList.jsx
index 552cbb0..4b71687 100644
--- a/src/components/WorksheetList.jsx
+++ b/src/components/WorksheetList.jsx
@@ -1,12 +1,22 @@
 import { useState } from 'react'
-import { FaClock, FaUser, FaExchangeAlt, FaComment, FaChevronDown, FaChevronUp } from 'react-icons/fa'
-import { serviceTypeLabel } from '../lib/ticketForm'
+import { FaClock, FaUser, FaExchangeAlt, FaComment, FaChevronDown, FaChevronUp, FaPen } from 'react-icons/fa'
+import { serviceTypeLabel, canEditWorksheetTimes } from '../lib/ticketForm'
 
 function needsTimeEntry(ws) {
   return ws.serviceType === 'GIT' && (!ws.startTime || !Number(ws.totalTime))
 }
 
-export default function WorksheetList({ worksheets, totalTime, loading, onEditTime, onTogglePlan }) {
+const headerButtonStyle = {
+  background: 'rgba(255,255,255,0.25)',
+  color: 'white',
+  border: '1px solid rgba(255,255,255,0.4)',
+  borderRadius: '6px',
+  padding: '2px 10px',
+  fontSize: '0.8rem',
+  marginRight: '8px',
+}
+
+export default function WorksheetList({ worksheets, totalTime, loading, onEditTime, onTogglePlan, currentUser, onEditTimes }) {
   const [expandedWorksheets, setExpandedWorksheets] = useState({})
   if (loading) {
     return (
@@ -157,14 +167,7 @@ export default function WorksheetList({ worksheets, totalTime, loading, onEditTi
                       <button
                         type="button"
                         className="btn btn-sm"
-                        style={{
-                          background: 'rgba(255,255,255,0.25)',
-                          color: 'white',
-                          border: '1px solid rgba(255,255,255,0.4)',
-                          borderRadius: '6px',
-                          padding: '2px 10px',
-                          fontSize: '0.8rem',
-                        }}
+                        style={headerButtonStyle}
                         onClick={(e) => {
                           e.stopPropagation()
                           onEditTime(ws)
@@ -173,6 +176,20 @@ export default function WorksheetList({ worksheets, totalTime, loading, onEditTi
                         <FaClock className="me-1" /> Zeit nachtragen
                       </button>
                     )}
+                    {onEditTimes && canEditWorksheetTimes(ws, currentUser) && (
+                      <button
+                        type="button"
+                        className="btn btn-sm"
+                        title="Beginn, Ende und Arbeitszeit ändern"
+                        style={headerButtonStyle}
+                        onClick={(e) => {
+                          e.stopPropagation()
+                          onEditTimes(ws)
+                        }}
+                      >
+                        <FaPen className="me-1" /> Zeiten bearbeiten
+                      </button>
+                    )}
                     {onTogglePlan && !ws.isComment && Number(ws.totalTime) > 0 && (
                       <button
                         type="button"
diff --git a/src/components/WorksheetTimesModal.jsx b/src/components/WorksheetTimesModal.jsx
new file mode 100644
index 0000000..d122144
--- /dev/null
+++ b/src/components/WorksheetTimesModal.jsx
@@ -0,0 +1,140 @@
+import { useState } from 'react'
+import { FaTimes } from 'react-icons/fa'
+import { isoToGermanDate, timeToWoms, germanDateToIso, womsTimeToInput, minutesBetween } from '../lib/ticketForm'
+import { DateTimeInput } from './ui'
+
+// Gespeichert ist dd.mm.yyyy / hhmm, die Kalender-Felder brauchen yyyy-mm-dd / hh:mm
+const formFromWorksheet = (worksheet) => ({
+  startDate: germanDateToIso(worksheet.startDate),
+  startTime: womsTimeToInput(worksheet.startTime),
+  endDate: germanDateToIso(worksheet.endDate || worksheet.startDate),
+  endTime: womsTimeToInput(worksheet.endTime)
+})
+
+/**
+ * Beginn, Ende und Arbeitszeit eines Arbeitsblatts nachtraeglich aendern.
+ * Wer das darf, entscheidet canEditWorksheetTimes (useWorksheets).
+ */
+export default function WorksheetTimesModal({ worksheet, onClose, onSave }) {
+  const [formData, setFormData] = useState(() => formFromWorksheet(worksheet))
+  // null = die Arbeitszeit folgt Beginn und Ende. Passte sie schon vorher nicht dazu,
+  // wurde sie von Hand eingetragen (z.B. ohne Pause) und bleibt stehen.
+  const [manualTotal, setManualTotal] = useState(() => {
+    const stored = Number(worksheet.totalTime) || 0
+    return !stored || stored === minutesBetween(formData.startTime, formData.endTime) ? null : stored
+  })
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState('')
+
+  const calculatedTotal = minutesBetween(formData.startTime, formData.endTime)
+  const totalTime = manualTotal ?? calculatedTotal ?? 0
+
+  const handleChange = (field, value) => {
+    setFormData(prev => ({ ...prev, [field]: value }))
+  }
+
+  // Das Ende darf nicht vor dem Start liegen, deshalb rueckt es mit
+  const handleStartDateChange = (value) => {
+    setFormData(prev => ({
+      ...prev,
+      startDate: value,
+      endDate: value && prev.endDate && prev.endDate < value ? value : prev.endDate
+    }))
+  }
+
+  const handleSubmit = async (e) => {
+    e.preventDefault()
+    setSaving(true)
+    setError('')
+    try {
+      const result = await onSave(worksheet, {
+        startDate: isoToGermanDate(formData.startDate),
+        startTime: timeToWoms(formData.startTime),
+        endDate: isoToGermanDate(formData.endDate),
+        endTime: timeToWoms(formData.endTime),
+        totalTime: parseInt(totalTime, 10) || 0
+      })
+      if (result?.success) {
+        onClose()
+        return
+      }
+      setError(result?.error || 'Speichern fehlgeschlagen')
+    } catch (err) {
+      setError(err.message || 'Speichern fehlgeschlagen')
+    }
+    setSaving(false)
+  }
+
+  return (
+    <div className="overlay">
+      <span className="overlay-close" onClick={onClose}>
+        <FaTimes />
+      </span>
+      <div className="overlay-content" style={{ maxWidth: 560 }}>
+        {/* Kurzer Titel: auf dem Handy laeuft ein langer unter das Schliessen-X */}
+        <h2 className="mb-2">Zeiten bearbeiten</h2>
+        <p className="text-grey" style={{ fontSize: '14px', marginBottom: '16px' }}>WSID {worksheet.wsid}</p>
+
+        {error && (
+          <div className="bg-red text-white p-2 mb-2" style={{ borderRadius: '4px' }}>
+            {error}
+          </div>
+        )}
+
+        <form onSubmit={handleSubmit}>
+          <div className="form-group">
+            <label className="form-label" htmlFor="worksheet-times-start">Beginn</label>
+            <DateTimeInput
+              id="worksheet-times-start"
+              timeLabel="Uhrzeit Beginn"
+              required
+              date={formData.startDate}
+              time={formData.startTime}
+              onDateChange={handleStartDateChange}
+              onTimeChange={(value) => handleChange('startTime', value)}
+            />
+          </div>
+
+          <div className="form-group">
+            <label className="form-label" htmlFor="worksheet-times-end">Ende</label>
+            <DateTimeInput
+              id="worksheet-times-end"
+              timeLabel="Uhrzeit Ende"
+              required
+              min={formData.startDate}
+              date={formData.endDate}
+              time={formData.endTime}
+              onDateChange={(value) => handleChange('endDate', value)}
+              onTimeChange={(value) => handleChange('endTime', value)}
+            />
+          </div>
+
+          <div className="form-group">
+            <label className="form-label" htmlFor="worksheet-times-total">Arbeitszeit (Minuten)</label>
+            <input
+              id="worksheet-times-total"
+              type="number"
+              className="form-control"
+              min="0"
+              step="1"
+              value={totalTime}
+              onChange={(e) => setManualTotal(e.target.value)}
+              placeholder="0"
+            />
+            <small style={{ color: '#a0aec0', fontSize: '12px' }}>
+              {manualTotal === null && calculatedTotal !== null
+                ? '✓ Automatisch berechnet'
+                : 'Manuell eingeben'}
+            </small>
+          </div>
+
+          <div className="text-center mt-2">
+            <button type="submit" className="btn btn-dark" disabled={saving}>
+              {saving ? 'Speichert...' : 'Speichern'}
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}
diff --git a/src/hooks/useWorksheets.js b/src/hooks/useWorksheets.js
index 38c200f..ec81baa 100644
--- a/src/hooks/useWorksheets.js
+++ b/src/hooks/useWorksheets.js
@@ -1,5 +1,6 @@
 import { useState, useEffect, useCallback } from 'react'
 import { databases, DATABASE_ID, COLLECTIONS, Query, ID, isDemoMode } from '../lib/appwrite'
+import { canEditWorksheetTimes } from '../lib/ticketForm'
 
 const DEMO_MODE = isDemoMode
 
@@ -388,6 +389,17 @@ export function useWorksheets(woid = null) {
     }
   }
 
+  /**
+   * Aendert nachtraeglich Beginn, Ende und Arbeitszeit - nur fuer den Ersteller
+   */
+  const updateWorksheetTimes = async (worksheet, times, currentUser) => {
+    if (!canEditWorksheetTimes(worksheet, currentUser)) {
+      return { success: false, error: 'Nur wer das Arbeitsblatt erstellt hat, kann die Zeiten ändern.' }
+    }
+    const { startDate, startTime, endDate, endTime, totalTime } = times
+    return updateWorksheet(worksheet.$id, { startDate, startTime, endDate, endTime, totalTime })
+  }
+
   /**
    * Löscht ein Worksheet (sollte normalerweise nicht erlaubt sein - Audit Trail!)
    */
@@ -468,6 +480,7 @@ export function useWorksheets(woid = null) {
     error,
     createWorksheet,
     updateWorksheet,
+    updateWorksheetTimes,
     deleteWorksheet,
     refresh: fetchWorksheets,
     getTotalTime,
diff --git a/src/lib/ticketForm.js b/src/lib/ticketForm.js
index e025158..52ac57e 100644
--- a/src/lib/ticketForm.js
+++ b/src/lib/ticketForm.js
@@ -3,6 +3,8 @@
    (siehe planboard.js). Die Kalender-Felder des Browsers liefern dagegen
    "yyyy-mm-dd" bzw. "hh:mm" - umgerechnet wird erst beim Speichern. */
 
+import { parseGermanDate, formatTime, dayKey } from './planboard'
+
 // Service Type: gespeichert werden die bisherigen Werte, angezeigt wird Deutsch
 export const SERVICE_TYPES = [
   { value: 'Remote', label: 'Fernwartung (remote)' },
@@ -21,6 +23,12 @@ export function serviceTypeLabel(value) {
   return SERVICE_TYPE_SHORT[String(value || '').trim().toLowerCase()] || value
 }
 
+// Zeiten eines Arbeitsblatts darf nur aendern, wer es angelegt hat.
+// Reine Kommentare haben keine Arbeitszeit und bleiben aussen vor.
+export function canEditWorksheetTimes(worksheet, user) {
+  return Boolean(user?.$id) && worksheet?.employeeId === user.$id && !worksheet.isComment
+}
+
 const pad = (n) => String(n).padStart(2, '0')
 
 // Heutiges Datum in Ortszeit als "yyyy-mm-dd" (Wert fuer <input type="date">)
@@ -40,6 +48,17 @@ export function timeToWoms(value) {
   return m ? `${m[1].padStart(2, '0')}${m[2]}` : ''
 }
 
+// Rueckweg fuers Bearbeiten: "26.09.2026" (auch "2.5.2026") -> "2026-09-26", sonst ""
+export function germanDateToIso(value) {
+  const date = parseGermanDate(value)
+  return date ? dayKey(date) : ''
+}
+
+// "0930" -> "09:30", sonst ""
+export function womsTimeToInput(value) {
+  return formatTime(value)
+}
+
 // Minuten von "hh:mm" bis "hh:mm"; liegt das Ende davor, geht es ueber Mitternacht
 export function minutesBetween(start, end) {
   const a = /^(\d{1,2}):(\d{2})/.exec(String(start || ''))