src/tools/eta-calculator/eta-calculator.service.ts


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import { formatDuration } from 'date-fns';

export function formatMsDuration(duration: number) {
  const ms = Math.floor(duration % 1000);
  const secs = Math.floor(((duration - ms) / 1000) % 60);
  const mins = Math.floor((((duration - ms) / 1000 - secs) / 60) % 60);
  const hrs = Math.floor((((duration - ms) / 1000 - secs) / 60 - mins) / 60);

  return (
    formatDuration({
      hours: hrs,
      minutes: mins,
      seconds: secs,
    }) + (ms > 0 ? ` ${ms} ms` : '')
  );
}