Function getStartingYear

src/material/datepicker/multi-year-view.ts:439–452

* We pick a "starting" year such that either the maximum year would be at the end * or the minimum year would be at the beginning of a page.

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

 * or the minimum year would be at the beginning of a page.
 */
function getStartingYear<D>(
  dateAdapter: DateAdapter<D>,
  minDate: D | null,
  maxDate: D | null,
): number {
  let startingYear = 0;
  if (maxDate) {
    const maxYear = dateAdapter.getYear(maxDate);
    startingYear = maxYear - yearsPerPage + 1;
  } else if (minDate) {
    startingYear = dateAdapter.getYear(minDate);
  }
  return startingYear;
}

/** Gets remainder that is non-negative, even if first number is negative */
function euclideanModulo(a: number, b: number): number {