Function isSameMultiYearView

src/material/datepicker/multi-year-view.ts:404–418

(
  dateAdapter: DateAdapter<D>,
  date1: D,
  date2: D,
  minDate: D | null,
  maxDate: D | null,
)

}

export function isSameMultiYearView<D>(
  dateAdapter: DateAdapter<D>,
  date1: D,
  date2: D,
  minDate: D | null,
  maxDate: D | null,
): boolean {
  const year1 = dateAdapter.getYear(date1);
  const year2 = dateAdapter.getYear(date2);
  const startingYear = getStartingYear(dateAdapter, minDate, maxDate);
  return (
    Math.floor((year1 - startingYear) / yearsPerPage) ===
    Math.floor((year2 - startingYear) / yearsPerPage)
  );
}

/**
 * When the multi-year view is first opened, the active year will be in view.