Fix #4076: Trigger onCalendarClose event and onChange even when the same date is selected as the start and the end date in a date range

src/date_utils.js

@@ -862,3 +862,42 @@ export function startOfMinute(d) {
 export function isSameMinute(d1, d2) {
   return startOfMinute(d1).getTime() === startOfMinute(d2).getTime();
 }
+
+/**
+ * Returns a cloned date with midnight time (00:00:00)
+ *
+ * @param {Date} date The date for which midnight time is required
+ * @param {Date} dateToCompare the date to compare with
+ * @returns {Date} A new datetime object representing the input date with midnight time
+ */
+export function getMidnightDate(date) {
+  if (!isDate(date)) {
+    throw new Error("Invalid date");
+  }
+
+  const dateWithoutTime = new Date(date);
+  dateWithoutTime.setHours(0, 0, 0, 0);
+  return dateWithoutTime;
+}
+
+/**
+ * Is the first date before the second one?
+ *
+ * @param {Date} date The date that should be before the other one to return true
+ * @param {Date} dateToCompare The date to compare with
+ * @returns {boolean} The first date is before the second date
+ *
+ * Note:
+ *  This function considers the mid-night of the given dates for comparison.
+ *  It evaluates whether date is before dateToCompare based on their mid-night timestamps.
+ */
+export function isDateBefore(date, dateToCompare) {
+  if (!isDate(date) || !isDate(dateToCompare)) {
+    throw new Error("Invalid date received");
+  }
+
+  const midnightDate = getMidnightDate(date);
+  const midnightDateToCompare = getMidnightDate(dateToCompare);
+
+  return isBefore(midnightDate, midnightDateToCompare);
+}

src/index.jsx

@@ -46,6 +46,7 @@ import {
   isMonthDisabled,
   isYearDisabled,
   getHolidaysMap,
+  isDateBefore,
 } from "./date_utils";
 import TabLoop from "./tab_loop";
 import onClickOutside from "react-onclickoutside";
@@ -591,8 +592,10 @@ export default class DatePicker extends React.Component {
       if (!this.props.selectsRange) {
         this.setOpen(false);
       }
+
       const { startDate, endDate } = this.props;
-      if (startDate && !endDate && !isBefore(date, startDate)) {
+
+      if (startDate && !endDate && !isDateBefore(date, startDate)) {
         this.setOpen(false);
       }
     }
@@ -655,7 +658,7 @@ export default class DatePicker extends React.Component {
         if (noRanges) {
           onChange([changedDate, null], event);
         } else if (hasStartRange) {
-          if (isBefore(changedDate, startDate)) {
+          if (isDateBefore(changedDate, startDate)) {
             onChange([changedDate, null], event);
           } else {
             onChange([startDate, changedDate], event);

test/date_utils_test.test.js

@@ -39,6 +39,8 @@ import {
   getHolidaysMap,
   arraysAreEqual,
   startOfMinute,
+  isDateBefore,
+  getMidnightDate,
 } from "../src/date_utils";
 import setMinutes from "date-fns/setMinutes";
 import setHours from "date-fns/setHours";
@@ -1248,4 +1250,51 @@ describe("date_utils", () => {
       expect(startOfMinute(d)).toEqual(expected);
     });
   });
+
+  describe("getMidnightDate", () => {
+    it("should return a date with midnight time when a valid date is provided", () => {
+      const inputDate = new Date(2023, 0, 1, 12, 30, 45); // January 1, 2023, 12:30:45 PM
+
+      const result = getMidnightDate(inputDate);
+
+      expect(result).toEqual(new Date(2023, 0, 1, 0, 0, 0, 0)); // January 1, 2023, 00:00:00.000
+    });
+
+    it("should throw an error when an invalid date is provided", () => {
+      const invalidDate = "not a date";
+
+      expect(() => {
+        getMidnightDate(invalidDate);
+      }).toThrowError("Invalid date");
+    });
+  });
+
+  describe("isDateBefore", () => {
+    it("should return true when date is before dateToCompare", () => {
+      const date = new Date(2022, 11, 31); // December 31, 2022
+      const dateToCompare = new Date(2023, 0, 1); // January 1, 2023
+
+      const result = isDateBefore(date, dateToCompare);
+
+      expect(result).toBe(true);
+    });
+
+    it("should return false when date is not before dateToCompare", () => {
+      const date = new Date(2023, 0, 1); // January 1, 2023
+      const dateToCompare = new Date(2022, 11, 31); // December 31, 2022
+
+      const result = isDateBefore(date, dateToCompare);
+
+      expect(result).toBe(false);
+    });
+
+    it("should throw an error when either date or dateToCompare is not a valid date", () => {
+      expect(() => {
+        const invalidDate = "not a date";
+        const validDate = new Date(2023, 0, 1); // January 1, 2023
+
+        isDateBefore(invalidDate, validDate);
+      }).toThrowError();
+    });
+  });
 });

test/datepicker_test.test.js

@@ -4,7 +4,7 @@ import { findDOMNode } from "react-dom";
 import TestUtils from "react-dom/test-utils";
 import { enUS, enGB } from "date-fns/locale";
 import { mount } from "enzyme";
-import { render, fireEvent } from "@testing-library/react";
+import { render, act, waitFor, fireEvent } from "@testing-library/react";
 import defer from "lodash/defer";
 import DatePicker, { registerLocale } from "../src/index.jsx";
 import Day from "../src/day.jsx";
@@ -44,6 +44,18 @@ function goToLastMonth(datePicker) {
   TestUtils.Simulate.click(findDOMNode(lastMonthButton));
 }
 
+function formatDayWithZeros(day) {
+  const dayString = day.toString();
+
+  if (dayString.length === 1) {
+    return `00${dayString}`;
+  }
+  if (dayString.length === 2) {
+    return `0${dayString}`;
+  }
+  return dayString;
+}
+
 describe("DatePicker", () => {
   afterEach(() => {
     jest.resetAllMocks();
@@ -2019,6 +2031,94 @@ describe("DatePicker", () => {
       expect(onChangeSpy.mock.calls[0][0][0]).toBeNull();
       expect(onChangeSpy.mock.calls[0][0][1]).toBeNull();
     });
+
+    it("should call the onChange even when the startDate and the endDate is same in the range (case when we programmatically set the startDate, but set the same endDate through UI)", async () => {
+      let startDate = new Date();
+      let endDate = null;
+
+      const onChangeSpy = jest.fn();
+
+      const { container } = render(
+        <DatePicker
+          startDate={startDate}
+          endDate={endDate}
+          onChange={onChangeSpy}
+          shouldCloseOnSelect
+          selectsRange
+        />,
+      );
+
+      const input = container.querySelector("input");
+      expect(input).toBeTruthy();
+      fireEvent.click(input);
+
+      let calendar = container.querySelector(".react-datepicker");
+      expect(calendar).toBeTruthy();
+
+      // Select the same date as the start date
+      const startDatePrefixedWithZeros = formatDayWithZeros(
+        startDate.getDate(),
+      );
+      const endDateElement = container.querySelector(
+        `.react-datepicker__day--${startDatePrefixedWithZeros}`,
+      );
+      fireEvent.click(endDateElement);
+
+      await act(async () => {
+        await waitFor(() => {
+          expect(onChangeSpy).toHaveBeenCalled();
+        });
+      });
+    });
+
+    it("should hide the calendar even when the startDate and the endDate is same in the range", async () => {
+      let startDate = new Date();
+      let endDate = null;
+
+      const onCalendarCloseSpy = jest.fn();
+
+      const onChange = (dates) => {
+        const [start, end] = dates;
+        startDate = start;
+        endDate = end;
+      };
+
+      const { container } = render(
+        <DatePicker
+          startDate={startDate}
+          endDate={endDate}
+          onChange={onChange}
+          onCalendarClose={onCalendarCloseSpy}
+          shouldCloseOnSelect
+          selectsRange
+        />,
+      );
+
+      const input = container.querySelector("input");
+      expect(input).toBeTruthy();
+      fireEvent.click(input);
+
+      let calendar = container.querySelector(".react-datepicker");
+      expect(calendar).toBeTruthy();
+
+      // Select the same date as the start date
+      const startDatePrefixedWithZeros = formatDayWithZeros(
+        startDate.getDate(),
+      );
+      const endDateElement = container.querySelector(
+        `.react-datepicker__day--${startDatePrefixedWithZeros}`,
+      );
+      fireEvent.click(endDateElement);
+
+      await act(async () => {
+        await waitFor(() => {
+          calendar = container.querySelector(".react-datepicker");
+          expect(calendar).toBeFalsy();
+
+          expect(onCalendarCloseSpy).toHaveBeenCalled();
+        });
+      });
+    });
   });
 
   describe("duplicate dates when multiple months", () => {