Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

by brigand February 10, 2019

JavaScript

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

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JSFiddle - React, Tailwind, and code Playground

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Use pre-released features

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