A React Hooks-based component using Luxon to format a date to a relative string representation, updating that string once a minute.

RelativeTime.jsx

import React from 'react'
import PropTypes from 'prop-types'
import { DateTime } from 'luxon'

const RelativeTime = (props) => {
  const dt = DateTime.fromJSDate(props.time)
  const [relTime, setRelTime] = useState(dt.toRelative())
  const [intervalID, setIntervalID] = useState()

  useEffect(() => {
    let mounted = true
    setIntervalID(setInterval(() => {
      if (mounted) {
        setRelTime(dt.toRelative())
      }
    }, 60000)
    )
    return function cleanup () {
      mounted = false
      clearInterval(intervalID)
    }
  }, [])

  return (
    <>
      {relTime}
    </>
  )
}

RelativeTime.propTypes = {
  time: PropTypes.instanceOf(Date)
}

export default RelativeTime