Add Work Days And Hours in moment object

addWorkDaysHours.js

const moment = require('moment');

moment.fn.addWorkdays = function addWorkdays(days) {
    // Getting negative / positive increment
    const increment = days / Math.abs(days);
    // Looping weeks for each full 5 workdays
    const date = this.clone().add(Math.floor(Math.abs(days) / 5) * 7 * increment, 'days');
    // Account for starting on Saturdays and Sundays
    if (date.isoWeekday() === 6) { date.add(-increment, 'days'); }
    else if (date.isoWeekday() === 7) { date.add(-2 * increment, 'days'); }
    // Adding / removing remaining days in a short loop, jumping over weekends
    let remaining = days % 5;
    while (remaining !== 0) {
        date.add(increment, 'days');
        if (date.isoWeekday() !== 6 && date.isoWeekday() !== 7)
            remaining -= increment;
    }
    return date;
};

const addWorkHoursDays = ({ value, unit = 'days'}) => { 
        let days = 0;
        let remainingHours = 0;
        if (unit === 'hours') {
            days = Math.floor(Math.abs(value / 24));
            remainingHours = value % 24;
        } else {
            days = value;
        }
        // moment().addWorkdays - this method add days in moment passed
        const lastWorkDay = moment().addWorkdays(days);   // return momentObject
        // Add Remaining hours in return moment object
        if (remainingHours) {
            lastWorkDay.add(remainingHours, 'hours');
        }
        // check after its saturday or sunday after adding hours, if yes then add more days in it
        if (lastWorkDay.isoWeekday() === 6) {
            lastWorkDay.add(2, 'days');
        }
        if (lastWorkDay.isoWeekday() === 7) {
            lastWorkDay.add(7, 'days');
        }
        return lastWorkDay;  // return moment
}