@head.js/analytics.js-new-date/lib/milliseconds.js

Creates a new Date, but accepts a few more input types than normal.

"use strict";

/**
 * Matcher.
 */

var matcher = /\d{13}/;

/**
 * Check whether a string is a millisecond date string.
 *
 * @param {string} string
 * @return {boolean}
 */
exports.is = function (string) {
  return matcher.test(string);
};

/**
 * Convert a millisecond string to a date.
 *
 * @param {string} millis
 * @return {Date}
 */
exports.parse = function (millis) {
  millis = parseInt(millis, 10);
  return new Date(millis);
};