src/pages/lesson-list.tsx

@@ -453,7 +453,7 @@ const LessonList = () => {
                         </Td>
                       )}
                       <Td textAlign="center">
-                        {dayjs(lesson.date).format('H:mm DD.MM.YY')}
+                        {dayjs(lesson.date).format(groupByDate ? 'HH:mm' : 'HH:mm DD.MM.YY')}
                       </Td>
                       <Td>{lesson.name}</Td>
                       {isTeacher(user) && (