relativeTime.ts

/** Compact "time ago" label for a past timestamp, relative to `now` (ms). */
export function relativeTime(ts: number, now: number): string {
  const s = Math.floor((now - ts) / 1000)
  if (s < 5) return 'just now'
  if (s < 60) return `${s}s ago`
  const m = Math.floor(s / 60)
  if (m < 60) return `${m}m ago`
  const h = Math.floor(m / 60)
  if (h < 24) return `${h}h ago`
  return `${Math.floor(h / 24)}d ago`
}

/** True when two epoch-ms timestamps fall on the same local calendar day. */
export function isSameDay(a: number, b: number): boolean {
  const da = new Date(a)
  const db = new Date(b)
  return (
    da.getFullYear() === db.getFullYear() &&
    da.getMonth() === db.getMonth() &&
    da.getDate() === db.getDate()
  )
}