diff --git a/oop-exam/date_average.py b/oop-exam/date_average.py
new file mode 100644
index 0000000..a47c1b5
--- /dev/null
+++ b/oop-exam/date_average.py
@@ -0,0 +1,95 @@
+from PyQt6.QtWidgets import (
+    QApplication, QWidget, QVBoxLayout, QHBoxLayout, QListWidget,
+    QPushButton, QLabel, QDateEdit, QListWidgetItem
+)
+from PyQt6.QtCore import QDate
+import sys
+
+class AverageDateCalculator(QWidget):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("Среднее значение дат")
+        self.resize(400, 300)
+
+        self.layout = QVBoxLayout()
+        self.setLayout(self.layout)
+
+        # Список дат
+        self.list_widget = QListWidget()
+        self.list_widget.setSelectionMode(QListWidget.SelectionMode.ExtendedSelection)
+        self.layout.addWidget(self.list_widget)
+
+        # Кнопки для добавления/удаления
+        btn_layout = QHBoxLayout()
+        self.add_btn = QPushButton("Добавить сегодня")
+        self.remove_btn = QPushButton("Удалить выбранные")
+        btn_layout.addWidget(self.add_btn)
+        btn_layout.addWidget(self.remove_btn)
+        self.layout.addLayout(btn_layout)
+
+        # Диапазон дат
+        range_layout = QHBoxLayout()
+        self.start_date = QDateEdit()
+        self.end_date = QDateEdit()
+        self.start_date.setCalendarPopup(True)
+        self.end_date.setCalendarPopup(True)
+        self.start_date.setDate(QDate.currentDate())
+        self.end_date.setDate(QDate.currentDate())
+        range_layout.addWidget(QLabel("С:"))
+        range_layout.addWidget(self.start_date)
+        range_layout.addWidget(QLabel("По:"))
+        range_layout.addWidget(self.end_date)
+        self.layout.addLayout(range_layout)
+
+        # Вывод среднего
+        self.result_label = QLabel("Среднее: —")
+        self.layout.addWidget(self.result_label)
+
+        # Сигналы
+        self.add_btn.clicked.connect(self.add_today)
+        self.remove_btn.clicked.connect(self.remove_selected)
+        self.list_widget.itemSelectionChanged.connect(self.compute_average)
+        self.start_date.dateChanged.connect(self.compute_average)
+        self.end_date.dateChanged.connect(self.compute_average)
+
+    def add_today(self):
+        today = QDate.currentDate()
+        item = QListWidgetItem(today.toString("yyyy-MM-dd"))
+        self.list_widget.addItem(item)
+        self.compute_average()
+
+    def remove_selected(self):
+        for item in self.list_widget.selectedItems():
+            self.list_widget.takeItem(self.list_widget.row(item))
+        self.compute_average()
+
+    def compute_average(self):
+        # Собираем даты
+        selected_items = self.list_widget.selectedItems()
+        if selected_items:
+            dates = [QDate.fromString(item.text(), "yyyy-MM-dd") for item in selected_items]
+        else:
+            # Если ничего не выделено, берем все элементы в диапазоне
+            start = self.start_date.date()
+            end = self.end_date.date()
+            dates = []
+            for i in range(self.list_widget.count()):
+                date = QDate.fromString(self.list_widget.item(i).text(), "yyyy-MM-dd")
+                if start <= date <= end:
+                    dates.append(date)
+
+        if not dates:
+            self.result_label.setText("Среднее: —")
+            return
+
+        # Вычисляем среднее
+        days_sum = sum([date.toJulianDay() for date in dates])
+        avg_day = days_sum // len(dates)
+        avg_date = QDate.fromJulianDay(avg_day)
+        self.result_label.setText(f"Среднее: {avg_date.toString('yyyy-MM-dd')}")
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+    window = AverageDateCalculator()
+    window.show()
+    sys.exit(app.exec())
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