Which day was the shortest?

daylengths.js

"use strict";

var tai = require("t-a-i");

var prevlen = undefined;
var prevcount = 0;
for(var d = Date.UTC(1961, 0, 1); d < Date.UTC(2017, 0, 1); d += 86400000) {
	var d2 = d + 86400000;
	var len = tai.unixToAtomic(d2) - tai.unixToAtomic(d);
	len = Math.round(len * 10000) / 10000;
	if(len === prevlen) {
		prevcount += 1;
	} else {
		if(prevlen !== undefined) {
			console.log(prevlen, prevcount);
		}
		prevlen = len;
		prevcount = 1;
	}
}
console.log(prevlen, prevcount);