export const formatTimestamp = (timestamp: number | undefined): string => {
  const d = new Date((timestamp ?? 0) * 1000)
  const month = ('0' + (d.getMonth() + 1)).slice(-2)
  return d.getFullYear() + '/' + month + '/' + d.getDate() + ' ' + d.getHours() + ':' + d.getMinutes()
}