uuidv1/uuidv1.js

‘uuidv1’ simply generates UUID v1 (with timestamp). Works in both Node.js and the browser. Lightweight. No dependencies.

/* ISC (c) 2018+ Jackens * https://github.com/jackens/uuidv1 */

(function (K, W) {
  function P (str, length) {
    return ('0000000000000000' + str).slice(-length)
  }

  function R () {
    return P((~~(Math.random() * 0x1000)).toString(16), 3)
  }

  function $ () {
    var now = new Date()
    var time = P((10000 * (+new Date(now.getTime() - now.getTimezoneOffset() * 60000) + 12219292800000)).toString(16), 16)
    return time.slice(8, 16) + '-' + time.slice(4, 8) + '-1' + time.slice(1, 4) + '-8' + R() + '-' + R() + R() + R() + R()
  }

  try {
    (W = window).require = function (I) { return W[K][I] };
    (W[K] = W[K] || {}).uuidv1 = $
  } catch (_) {
    module.exports = $
  }
})('module.exports')