time-left-ago/src/timeLeft.ts

Provide time left and time ago

import moment from 'moment'
import pluralize from 'pluralize'

export default function timeLeft(
  time: string | Date | null,
  ttl: number | null
): string {
  if (!time || !ttl) return ''

  const created = new Date(moment(time).valueOf()).valueOf()
  const sec = (ttl * 60 * 1000 - (new Date().valueOf() - created)) / 1000

  if (sec < 0) {
    return ''
  }
  if (sec <= 59) {
    return `${pluralize('second', Math.ceil(sec), true)} left`
  }
  if (sec > 59 && sec < 3540) {
    return `${pluralize('minute', Math.ceil(sec / 60), true)} left`
  }
  if (sec >= 3540 && sec < 86399) {
    return `${pluralize('hour', Math.ceil(sec / 3600), true)} left`
  }
  return `${pluralize('day', Math.ceil(sec / 86400), true)} left`
}