DateSlotsWorking.js

const neatCsv = require('neat-csv');
const fs = require('fs')

const file = "C:\\Users\\cosmi\\Desktop\\events.csv";

fs.readFile(file, async (err, data) => {
    if (err) {
        console.error(err)
        return
    }
    let content = await neatCsv(data)

    const weekly = content.filter(f => f.Schedule.includes("Weekly"));
    const monthly = content.filter(f => f.Schedule.includes("Monthly"));

    const recurrence = {
        "weekly" : 7,
        "monthly30" : 30,
        "monthly31" : 31
    };

    const weaklyBasisEvents = weekly.map((element => getDates(new Date(), new Date("June 29, 2020 13:00:00"), recurrence.weekly)));
    const monthlyBasisEvents = monthly.map((element => getDates(new Date(), new Date("June 29, 2020 13:00:00"), recurrence.monthly30)));
    console.log(weaklyBasisEvents);
    console.log("------------------");
    console.log(monthlyBasisEvents);


});


function getDates(start, end, recurrence) {

    let date = start;
    let dates = [];

    while((date = addDays(date, recurrence)) < end) {
        dates.push(date);
    }
    return dates;
}

function addDays(date, days) {
    let newDate = new Date(date);
    newDate.setDate(date.getDate() + days);
    return newDate;
}

events.csv