parse cron expression in javascript

cron.js

const cronstrue = require("cronstrue"); // https://www.npmjs.com/package/cronstrue
const cronparser = require("cron-parser"); // https://www.npmjs.com/package/cron-parser
const timeDiff = require("js-time-diff"); // https://www.npmjs.com/package/js-time-diff

let cronExpression = "5 * * * SUN";

let currentDate = new Date();
try {
  let nextDate = cronparser.parseExpression(cronExpression).next().toDate();
  let cronMeaning = cronstrue.toString(cronExpression);

  console.log("Cron expression: " + cronExpression);
  console.log("The job will run " + cronMeaning.toLowerCase());
  console.log("Current time is " + currentDate.toLocaleString("en-US"));
  console.log(
    "Next run will happen at " +
      nextDate.toLocaleString("en-US") +
      " i.e about " +
      timeDiff(nextDate, currentDate)
  );
} catch (err) {
  console.log("Invalid cron expression");
}