create-react-app-ts/test-config/DateMock.js

Scalable starter boilerplate for React applications

const constantDate = new Date('2017-12-31T23:59:59');

/**
 * Date constructor will now return
 * the same date each time it is called
 */
global.Date = class extends Date {
	constructor(date) {
		super(date);
		if (date) {
			return date;
		}

		return constantDate;
	}
};

const time = new Date().getTime();

export default time;