Function isBefore

core/src/components/datetime/utils/comparison.ts:17–26

(baseParts: DatetimeParts, compareParts: DatetimeParts)

 * Returns true is the selected day is before the reference day.
 */
export const isBefore = (baseParts: DatetimeParts, compareParts: DatetimeParts) => {
  return !!(
    baseParts.year < compareParts.year ||
    (baseParts.year === compareParts.year && baseParts.month < compareParts.month) ||
    (baseParts.year === compareParts.year &&
      baseParts.month === compareParts.month &&
      baseParts.day !== null &&
      baseParts.day < compareParts.day!)
  );
};

/**
 * Returns true is the selected day is after the reference day.