A Lambda handler to check whether today is a holiday, built to be used with Amazon Connect

holidayCheck.js

/*
 *
 * Source: https://www.state.nj.us/nj/about/facts/holidays/
 * Convert to JSON using ChatGPT prompt:
 * "Convert this table to JSON, converting dates to ISO format (pasted table)"
 *
 */
const HOLIDAYS = [
  {
    holiday: "New Year's Day",
    date: "2023-01-02",
    day: "Monday",
  },
  {
    holiday: "Martin Luther King Jr. Day",
    date: "2023-01-16",
    day: "Monday",
  },
  {
    holiday: "Presidents Day",
    date: "2023-02-20",
    day: "Monday",
  },
  {
    holiday: "Good Friday",
    date: "2023-04-07",
    day: "Friday",
  },
  {
    holiday: "Memorial Day",
    date: "2023-05-29",
    day: "Monday",
  },
  {
    holiday: "Juneteenth",
    date: "2023-06-16",
    day: "Friday",
  },
  {
    holiday: "Independence Day",
    date: "2023-07-04",
    day: "Tuesday",
  },
  {
    holiday: "Labor Day",
    date: "2023-09-04",
    day: "Monday",
  },
  {
    holiday: "Columbus Day",
    date: "2023-10-09",
    day: "Monday",
  },
  {
    holiday: "Election Day",
    date: "2023-11-07",
    day: "Tuesday",
  },
  {
    holiday: "Veteran's Day",
    date: "2023-11-10",
    day: "Friday",
  },
  {
    holiday: "Thanksgiving Day",
    date: "2023-11-23",
    day: "Thursday",
  },
  {
    holiday: "Christmas Day",
    date: "2023-12-25",
    day: "Monday",
  },
];

const date = new Date();
const options = {
  timeZone: "America/New_York",
  year: "numeric",
  month: "2-digit",
  day: "2-digit",
};
const usEasternDate = date.toLocaleDateString("en-US", options);
// Rearrange the date to ISO format (YYYY-MM-DD)
const [month, day, year] = usEasternDate.split("/");
const isoDate = `${year}-${month}-${day}`;

const handler = async (event) => {
  const eventDate = event?.Details?.Parameters?.date;
  const today = eventDate ? eventDate : isoDate;
  const holiday = HOLIDAYS.find((day) => day.date === today);
  return holiday ? holiday : { holiday: "none", date: today };
};

module.exports = {
  handler,
};

holidayCheck.test.js

const { handler } = require("./holidayCheck");

describe("Test the holidayCheck function", () => {
  it("Returns the current date", async () => {
    const date = new Date();
    const options = {
      timeZone: "America/New_York",
      year: "numeric",
      month: "2-digit",
      day: "2-digit",
    };
    const usEasternDate = date.toLocaleDateString("en-US", options);
    // Rearrange the date to ISO format (YYYY-MM-DD)
    const [month, day, year] = usEasternDate.split("/");
    const isoDate = `${year}-${month}-${day}`;
    const res = handler();
    expect(res.date).toEqual(isoDate);
  });

  it("Returns the a matching holiday", async () => {
    const res = handler({
      Details: {
        Parameters: {
          date: "2023-12-25",
        },
      },
    });
    expect(res.date).toEqual("2023-12-25");
    expect(res.holiday).toEqual("Christmas Day");
  });

  it("Doesn't return a holiday on an unmatched date", async () => {
    const res = handler({
      Details: {
        Parameters: {
          date: "2023-05-01",
        },
      },
    });
    expect(res.date).toEqual("2023-05-01");
    expect(res.holiday).toEqual("none");
  });
});