node-cron.js

'use strict';

const moment = require('moment');
const { CronJob } = require('cron');

function callback (job) {

}

exports.callback = function () {
  /*
    Seconds: 0-59
    Minutes: 0-59
    Hours: 0-23
    Day of Month: 1-31
    Months: 0-11
    Day of Week: 0-6
  */
  const sixHours = moment().add(6, 'hours').toDate();
  const fiveSeconds = moment().add(5, 'seconds').toDate();
  const time = process.env.NODE_ENV === 'production' ? sixHours : fiveSeconds;

  runJob(time, callback);
};

// date:
function runJob (date, cb, killJobOnComplete) {
  const job = new CronJob({
    cronTime: date,
    onTick: function () {
      cb().then( () => job.stop())
    },
    onComplete: () => {
      console.log('COMPLETED ~~~~');
      if (!killJobOnComplete) {
        const sixHours = moment().add(6, 'hours').toDate();
        const fiveMinutes = moment().add(5, 'minutes').toDate();
        const time = process.env.NODE_ENV === 'production' ? sixHours : fiveMinutes;
        runJob(time, cb)
      }
    },
    start: false,
    timezone: 'America/Sao_Paulo',
    context: null,
    runOnInit: false
  });
  job.start();
}

exports.runJob = runJob;