Calculate Business Hours in Nintex Form

Had a request to create a deadline due date utilizing business hours. Here’s the script. I’m still using the moment.js library for other due date calculations. I’ve also included code here to update the HH:MM blocks of the Nintex Date/Time field.

NWF.FormFiller.Events.RegisterAfterReady(function () {
    function parseDate(s) {
        var b = s.split(/\D/);
        return new Date(b[0], b[1] - 1, b[2], b[3] || 0, b[4] || 0);
    }
    NWF$("#" + dline).change(function (evt) {
        switch (evt.target.value) {
        case "Expedited":
            var d = new Date();
            var nwDate = moment(d).add('days', 1);
            var newrd = moment(nwDate).format('MM/DD/YYYY');
            var now = moment(d);
            var htime = moment(now.hour()).format('hh');
            var mtime = now.minutes();
            var df = NWF$('#' + ddate);
            var hourddl = df.parent().find("select[id*='DateHours']");
            var minddl = df.parent().find("select[id*='DateMinutes']");
            hourddl.val(htime);
            var rMinutes = 5 * (Math.floor(Math.abs(mtime / 5)));
            rMinutes = ("00" + rMinutes).substr(-2, 2);
            minddl.val(rMinutes);
            NWF$('#' + ddate).val(newrd);
            NWF$('#' + ddate).change();
            break;
        case "Standard":
            var startHour = 8;
            var endHour = 17;
            var weekendDays = {
                '6': 2,
                '0': 1
            };
            var date = new Date();
            var hrsPerDay = endHour - startHour;
            var hrsToAdd,
            hrsLeftToday;
            hours = 8;
            if (date.getHours() < startHour) {
                date.setHours(startHour, 0, 0, 0);
            } else if (date.getHours() > endHour) {
                date.setDate(date.getDate() + 1);
                date.setHours(startHour, 0, 0, 0);
            }
            if (date.getDay()in weekendDays) {
                date.setDate(date.getDate() + weekendDays[date.getDay()]);
                date.setHours(startHour, 0, 0, 0);
            }
            while (hours) {
                hrsLeftToday = endHour - date.getHours();
                if (!hrsLeftToday && hours) {
                    date.setDate(date.getDate() + 1);
                    date.setHours(startHour);
                }
                hrsToAdd = hrsLeftToday > hours ? hours : hrsLeftToday;
                hours -= hrsToAdd;
                if (hrsToAdd == hrsPerDay && hours) {
                    date.setDate(date.getDate() + 1);
                } else {
                    date.setHours(date.getHours() + hrsToAdd);
                }
                if (!hours) {
                    if (date.getHours() > endHour) {
                        date.setDate(date.getDate() + 1);
                        date.setHours(startHour + date.getHours() - endHour);
                    }
                    if (date.getHours() == endHour && (date.getMinutes() || date.getSeconds())) {
                        date.setDate(date.getDate() + 1);
                        date.setHours(startHour);
                    }
                }
                if (date.getDay()in weekendDays) {
                    date.setDate(date.getDate() + weekendDays[date.getDay()]);
                }
            }
            var nwDate = moment(date).format('MM/DD/YYYY');
            var now = moment(date);
            var htime = now.hour();
            var mtime = now.minutes();
            NWF$('#' + ddate).val(nwDate);
            var df = NWF$('#' + ddate);
            var hourddl = df.parent().find("select[id*='DateHours']");
            var minddl = df.parent().find("select[id*='DateMinutes']");
            hourddl.val(htime);
            var rMinutes = 5 * (Math.floor(Math.abs(mtime / 5)));
            rMinutes = ("00" + rMinutes).substr(-2, 2);
            minddl.val(rMinutes);
            NWF$('#' + ddate).change();
        }

    });
});