/**
 * The week a calendar draws, shared by the component and by whoever fetches the
 * reservations for it: the fetch is narrowed to the window on the backend, so
 * both sides have to agree on where a week starts.
 */

/** Monday, at midnight local time */
export function startOfWeek(date: Date): Date {
  const start = new Date(date)
  start.setHours(0, 0, 0, 0)
  start.setDate(start.getDate() - ((start.getDay() + 6) % 7))
  return start
}

export function addDays(date: Date, days: number): Date {
  const next = new Date(date)
  next.setDate(next.getDate() + days)
  return next
}