Can't create schedule with 30 or 31 day of every month

I’m trying to create a new job which should run every 30 or 31st day of month. Although cron strings like '10 10 31 * *', '0 10 10 31 * *' or '* 10 10 30 * *' seem to be correct, I get exception Month '1' is limited to '29' days. which pushes me to explicitly specify months that have 30 or 31 days. My proposal is not to reject cron strings that have at least one correct date in future.

[pincheira]

Using the L alias is not supported as of July 20th 2018, but you can always just do it on the 1st day of the month, with the earliest timezone in the world. At least that works for my case.

const earliestTimezone = 'Pacific/Kiritimati';
const firstDayOfTheMonth = '0 0 1 * *'; // at 00:00
const job = new CronJob({
  cronTime: firstDayOfTheMonth,
  onTick: myFunctionToBeRun,
  start: true,
  timeZone: earliestTimezone
});

[haifahrul]

Maybe you can use the logic here. You can use package momentJS.

var CronJob = require('cron').CronJob;
var moment = require('moment');

new CronJob('0 00 16 28-31 * *, function() {
  if (isLastDayOfMonth()) {
    doSomeStuff()
  }
}, null, true, 'America/Los_Angeles');

function isLastDayOfMonth(){
  const currentDay  =  moment().format('YYYY-MM-DD');
  const lastDayOfCurrentMonth  =  moment(date).endOf('month').format('YYYY-MM-DD');

  if (currentDate === lastDayOfCurrentMonth) {
    return true;
  } else {
    return false;
  }
}

function doSomeStuff(){
  // your task here.
}

The cron will be run every 28 - 31 day, and then check whether current day is a last day of current month.