JSFiddle - React, Tailwind, and code Playground

by brigand

JavaScript

function jday(date) {
    const firstDay = new Date(0);
    firstDay.setUTCFullYear(new Date().getUTCFullYear());
    console.log('f', firstDay.toISOString())
    const day = `${Math.floor((date - firstDay) / (24 * 60 * 60 * 1000))}`;
    console.log(day)
    return day.padStart(3, '0');
}
jday(new Date())
jday(new Date('2018-07-08'))