open-vault/ui/app/helpers/format-duration.js

import { helper } from '@ember/component/helper';
import { formatDuration, intervalToDuration } from 'date-fns';

export function duration([time]) {
  // intervalToDuration creates a durationObject that turns the seconds (ex 3600) to respective:
  // { years: 0, months: 0, days: 0, hours: 1, minutes: 0, seconds: 0 }
  // then formatDuration returns the filled in keys of the durationObject

  // time must be in seconds
  let duration = Number.parseInt(time, 10);
  if (isNaN(duration)) {
    return time;
  }
  return formatDuration(intervalToDuration({ start: 0, end: duration * 1000 }));
}

export default helper(duration);