Function isMonthDisabled

core/src/components/datetime/utils/state.ts:141–161

(
  refParts: DatetimeParts,
  {
    minParts,
    maxParts,
  }: {
    minParts?: DatetimeParts;
    maxParts?: DatetimeParts;
  }
)

 * current date value and min/max date constraints.
 */
export const isMonthDisabled = (
  refParts: DatetimeParts,
  {
    minParts,
    maxParts,
  }: {
    minParts?: DatetimeParts;
    maxParts?: DatetimeParts;
  }
) => {
  // If the year is disabled then the month is disabled.
  if (isYearDisabled(refParts.year, minParts, maxParts)) {
    return true;
  }
  // If the date value is before the min date, then the month is disabled.
  // If the date value is after the max date, then the month is disabled.
  if ((minParts && isBefore(refParts, minParts)) || (maxParts && isAfter(refParts, maxParts))) {
    return true;
  }
  return false;
};

/**
 * Given a working date, an optional minimum date range,