Function alignCenter

packages/react-stately/src/calendar/utils.ts:35–52

(
  date: CalendarDate,
  duration: DateDuration,
  locale: string,
  minValue?: DateValue | null,
  maxValue?: DateValue | null
)

}

export function alignCenter(
  date: CalendarDate,
  duration: DateDuration,
  locale: string,
  minValue?: DateValue | null,
  maxValue?: DateValue | null
): CalendarDate {
  let halfDuration: DateDuration = {};
  for (let key in duration) {
    halfDuration[key] = Math.floor(duration[key] / 2);
    if (halfDuration[key] > 0 && duration[key] % 2 === 0) {
      halfDuration[key]--;
    }
  }

  let aligned = alignStart(date, duration, locale).subtract(halfDuration);
  return constrainStart(date, aligned, duration, locale, minValue, maxValue);
}

export function alignStart(
  date: CalendarDate,