export function nowIso(): string {
  return new Date().toISOString()
}

export function addHours(baseIso: string | null | undefined, hours: number): string {
  const baseTime = baseIso ? new Date(baseIso).getTime() : Date.now()
  return new Date(baseTime + hours * 60 * 60 * 1000).toISOString()
}