website/examples-v8/ModifiersToday.tsx

import { useState } from "react";

import { DayMouseEventHandler, DayPicker } from "./react-day-picker-v8";

export function ModifiersToday() {
  const initialFooter = <p>Try clicking the today’s date.</p>;
  const [footer, setFooter] = useState(initialFooter);

  const handleDayClick: DayMouseEventHandler = (day, modifiers) => {
    if (modifiers.today) {
      setFooter(<p>You clicked the today’s date.</p>);
    } else {
      setFooter(initialFooter);
    }
  };
  return <DayPicker onDayClick={handleDayClick} footer={footer} />;
}