Script to get wake-up times based on sleep cycles adapted from sleepyti.me site's source code

wakeTimes.js

#! /usr/local/bin/node

// Get wake-up times based on sleep cycles if going to sleep now
// Code adapted from sleepyti.me source (surprisingly not minified)

const N_TIMES = 6; // Number of wake-up times to provide

let dates = [new Date(new Date().getTime() + 104 * 60000)];
for (let i = 1; i < N_TIMES; i++) {
    dates.push(new Date(dates[i - 1].getTime() + 90 * 60000));
}

function retDate(dateObj) {
    var formatted = '';
    var pm = false;
    if (dateObj.getHours() > 12) {
        formatted = dateObj.getHours() - 12;
        pm = true;
    } else if (dateObj.getHours() < 12 && dateObj.getHours() != 0) {
        formatted = dateObj.getHours();
    } else if (dateObj.getHours() == 0) {
        formatted = "12";
    } else if (dateObj.getHours() == 12) {
        formatted = "12";
        pm = true;
    }
    if (dateObj.getMinutes() < 10) {
        formatted = formatted + ":0" + dateObj.getMinutes();
    } else {
        formatted = formatted + ":" + dateObj.getMinutes();
    }
    if (pm == true) {
        formatted = formatted + " PM";
    } else {
        formatted = formatted + " AM";
    }
    return formatted;
}

const times = dates.map(d => retDate(d));
console.log(times);