Which year was the longest?

yearlengths.js

"use strict"

const tai = require("t-a-i")

for (let y = 1961; y <= new Date().getFullYear(); y++) {
	const start = tai.unixToAtomic(Date.UTC(y, 0, 1))
	const end = tai.unixToAtomic(Date.UTC(y + 1, 0, 1))
	console.log(y, end - start)
}