tod.js

setFakeTime(); // set time to 1 min ahead of actual time

const startTimeToD = Date.now(); // set startTime with time-of-day clock

setImmediate(() => {
  correctTimeNTP(); // synchronise the clock
});

await doSomething();

const endTimeToD = Date.now(); // set endTime with time-of-day clock
const durationToD = endTimeToD - startTimeToD;

console.log(`Duration measured by time-of-day clock\t: ${durationToD}ms`);