Simple component to show dates without server/client mismatch

example.tsx

import { format } from 'date-fns';

const App = () => {
  return <RenderDate>{format(new Date(utcDate), 'MMMM d, yyyy')}</RenderDate>
}

RenderDate.tsx

import classNames from 'classnames';
import { useEffect, useState } from 'react';

interface Props {
  children: React.ReactNode;
}

export const RenderDate = ({ children }: Props) => {
  const [hasMounted, setHasMounted] = useState(false);

  useEffect(() => {
    setHasMounted(true);
  }, []);

  const classes = classNames({
    'transition-opacity duration-300 ease-in-out': true,
    'opacity-0': !hasMounted,
    'opacity-100': hasMounted,
  });

  return (
    <time suppressHydrationWarning className={classes}>
      {children}
    </time>
  );
};

Even though this is a two-pass render, we still use suppressHydrationWarning cause we still need to maintain the layout.

If we were to return null on the server like this article we'd get a layout shift when the hydration is complete.