Fix #4268: Retain the selected date when changing the time

src/inputTime.jsx

@@ -31,9 +31,14 @@ export default class inputTime extends React.Component {
 
   onTimeChange = (time) => {
     this.setState({ time });
-    const date = new Date();
+
+    const { date: propDate } = this.props;
+    const isPropDateValid = propDate instanceof Date && !isNaN(propDate);
+    const date = isPropDateValid ? propDate : new Date();
+
     date.setHours(time.split(":")[0]);
     date.setMinutes(time.split(":")[1]);
+
     this.props.onChange(date);
   };
 

test/time_input_test.test.js

@@ -69,4 +69,49 @@ describe("timeInput", () => {
       new Date(new Date().setHours(14, 0, 0, 0)),
     );
   });
+
+  it("should trigger onChange event with the specified date prop if available", () => {
+    const mockOnChange = jest.fn();
+    const mockDate = new Date("2023-09-30");
+
+    const timeComponent = shallow(
+      <InputTimeComponent date={mockDate} onChange={mockOnChange} />,
+    );
+
+    const newTime = "13:00";
+    const input = timeComponent.find("input");
+    input.simulate("change", { target: { value: newTime } });
+
+    const expectedDate = new Date(mockDate);
+    const [expectedHours, expectedMinutes] = newTime.split(":");
+    expectedDate.setHours(expectedHours);
+    expectedDate.setMinutes(expectedMinutes);
+
+    expect(mockOnChange).toHaveBeenCalledWith(expectedDate);
+  });
+
+  it("should trigger onChange event with the default date when date prop is missing", () => {
+    const mockOnChange = jest.fn();
+    const mockCurrentDate = new Date("2023-09-30");
+    const dateSpy = jest
+      .spyOn(global, "Date")
+      .mockImplementation(() => mockCurrentDate);
+
+    const timeComponent = shallow(
+      <InputTimeComponent onChange={mockOnChange} />,
+    );
+
+    const newTime = "13:00";
+    const input = timeComponent.find("input");
+    input.simulate("change", { target: { value: newTime } });
+
+    const expectedDate = new Date(mockCurrentDate);
+    const [expectedHours, expectedMinutes] = newTime.split(":");
+    expectedDate.setHours(expectedHours);
+    expectedDate.setMinutes(expectedMinutes);
+
+    expect(mockOnChange).toHaveBeenCalledWith(expectedDate);
+
+    dateSpy.mockRestore();
+  });
 });