Calculate milliseconds between midnight and present time according to universal time

countdown.js

const now = new Date();
const utcnow = Date.UTC(
  now.getUTCFullYear(),
  now.getUTCMonth(),
  now.getUTCDate(),
  now.getUTCHours(),
  now.getUTCMinutes(),
  now.getUTCMilliseconds()
);
let utctmr = Date.UTC(
  now.getUTCFullYear(),
  now.getUTCMonth(),
  now.getUTCDate() + 1,
  0,
  0,
  0
);
setTimeout(() => {
  console.log('gotcha!')
}, utctmr - utcnow);