JSFiddle - React, Tailwind, and code Playground

JavaScript

const registrationDate = '2001-01-01T00:00:00.000Z';
  const regDate = registrationDate.split('.')[0]
	const todaysDate = new Date().toISOString().split('.')[0];
	const trialPeriod = todaysDate - regDate;
  console.log(trialPeriod);