Run a script automatically on sunrise/sunset

suntheme.js

// Scripts that are run:
//  On sunrise => ./day.sh
//  On sunset => ./night.sh

// To run nothing: write a blank file

// Change these to match your location
const long = 0.0000
const lat = 0.0000

const { exec } = require('child_process')
const SunCalc = require('suncalc')

const times = SunCalc.getTimes(new Date(), long, lat)
const sunrise = Date.parse(times.sunrise)
const sunset = Date.parse(times.sunset)
const now = Date.now()

// Daytime
if (now > sunrise && now < sunset) {

    let day_script = exec(
        './day.sh',
        (error, stdout, stderr) => {
            console.log(stdout);
            console.log(stderr);
            if (error !== null) {
                console.log(`exec error: ${error}`);
            }
    });

}

// Nighttime
else {

    let night_script = exec(
        './night.sh',
        (error, stdout, stderr) => {
            console.log(stdout);
            console.log(stderr);
            if (error !== null) {
                console.log(`exec error: ${error}`);
            }
    });

}