diff --git a/data.py b/data.py
index 36b545d..bff3a5c 100644
--- a/data.py
+++ b/data.py
@@ -179,14 +179,14 @@ class Report:
                 dsum += duration
                 dhours, rem = divmod(duration.seconds, 3600)
                 dmins, _ = divmod(rem, 60)
-                ret.append((task, start_time.strftime("%H:%M"), f"{dhours:02d}:{dmins:02d}"))
+                ret.append([task, start_time.strftime("%H:%M"), f"{dhours:02d}:{dmins:02d}"])
             else:
-                ret.append((task, start_time.strftime("%H:%M"), ""))
+                ret.append([task, start_time.strftime("%H:%M"), ""])
 
-        ret.append(("", "", ""))
+        ret.append(["", "", ""])
         dhours, rem = divmod(dsum.seconds, 3600)
         dmins, _ = divmod(rem, 60)
-        ret.append(("Sum", "", f"{dhours:02d}:{dmins:02d}"))
+        ret.append(["Sum", "", f"{dhours:02d}:{dmins:02d}"])
         return ret
 
     def save(self, report):
diff --git a/report.py b/report.py
index daeacec..0c29cf2 100644
--- a/report.py
+++ b/report.py
@@ -1,11 +1,14 @@
 from PySide2 import QtCore, QtGui, QtWidgets
 
+from datetime import datetime
+
 
 class Report(QtWidgets.QDialog):
     def __init__(self, parent, *args, **kwargs):
         super().__init__(parent, *args, **kwargs)
         self._report = None
         self._report_data = None
+        self._changing_items = False
 
         self.setWindowTitle("Report")
 
@@ -13,6 +16,7 @@ class Report(QtWidgets.QDialog):
         self.tableWidget.verticalHeader().hide()
         self.tableWidget.setColumnCount(3)
         self.tableWidget.setHorizontalHeaderLabels(["Task", "Start time", "Duration"])
+        self.tableWidget.cellChanged.connect(self.cell_changed)
         self.header = QtWidgets.QHeaderView(QtCore.Qt.Orientation.Horizontal)
         self.tableWidget.setHorizontalHeader(self.header)
 
@@ -56,6 +60,7 @@ class Report(QtWidgets.QDialog):
     def refresh_table(self):
         self.tableWidget.setRowCount(len(self._report_data))
 
+        self._changing_items = True
         for row, _ in enumerate(self._report_data):
             item0 = QtWidgets.QTableWidgetItem(self._report_data[row][0])
             self.tableWidget.setItem(row, 0, item0)
@@ -67,6 +72,7 @@ class Report(QtWidgets.QDialog):
             item2.setFlags(item2.flags() & QtCore.Qt.ItemIsEnabled)
             if row > len(self._report_data) - 4:
                 item1.setFlags(item1.flags() & QtCore.Qt.ItemIsEnabled)
+        self._changing_items = False
 
         self.tableWidget.resizeColumnsToContents()
 
@@ -112,3 +118,18 @@ class Report(QtWidgets.QDialog):
         self._report_data = self._report.report()
         self.refresh_table()
         self.update_prev_next()
+
+    @QtCore.Slot()
+    def cell_changed(self, row, column):
+        if self._changing_items:
+            return
+        item = self.tableWidget.item(row, column)
+        try:
+            new_time = datetime.strptime(item.text(), "%H:%M").time()
+        except ValueError:
+            item.setText(self._report_data[row][column])
+            return
+        self._report_data[row][column] = new_time.strftime("%H:%M")
+        self._report.save(self._report_data)
+        self._report_data = self._report.report()
+        self.refresh_table()