Workdays in range minus vacation days

workday-counter.js

#!/usr/bin/env node

const mode = process.argv[2];
const startDate = process.argv[3];
const endDate = process.argv[4];
const vacationDays = parseInt(process.argv[5], 10);
const sugar = require('sugar-date');
const moment = require('moment');

const parsedStartDate = moment(sugar.Date.create(startDate));
const parsedEndDate = moment(sugar.Date.create(endDate));

const holidays = [/*add your holidays here*/].map(d => moment(sugar.Date.create(d)));

function numberOfWorkDaysInInterval(parsedStartDate, parsedEndDate, holidays) {
  if (parsedEndDate < parsedStartDate) {
    throw new Error('invalid interval');
  }

  // Loop every day between start and end
  let days = 0;
  for (let _date = parsedStartDate; _date < parsedEndDate; _date += (1000*60*60*24)) {
    const date = new Date(_date);
    if (date.getDay() !== 0 && date.getDay() !== 6) {
      const holidayDiff = holidays.map(h => h.diff(date, 'seconds')).filter(diff => Math.abs(diff) === 0);
      if (holidayDiff.length === 0) {
        days++;
      }
    }
  }

  return days;
}

function numberOfWorkWeeksInInterval(parsedStartDate, parsedEndDate) {
  if (parsedEndDate < parsedStartDate) {
    throw new Error('invalid interval');
  }

  // Loop every day between start and end
  let weeks = 0;
  for (let _date = parsedStartDate; _date < parsedEndDate; _date += (1000*60*60*24)) {
    const date = new Date(_date);
    if (date.getDay() === 0) {
      weeks++;
    }
  }

  return weeks;
}

if (mode === 'workdays') {
  console.log(numberOfWorkDaysInInterval(parsedStartDate, parsedEndDate, holidays) - vacationDays);
}
if (mode === 'weeks') {
  console.log(numberOfWorkWeeksInInterval(parsedStartDate, parsedEndDate));
}