groundhog-day/index.js

A stupidly simple library for controlling time

let time = new Date('2016-02-02T11:00:00.000Z').getTime();

module.exports = {
  real: {
    now() {
      return Date.now();
    },
  },
  fake: {
    now() {
      return time;
    },
    fix(value) {
      time = new Date(value).getTime();
      if (Number.isNaN(time)) throw new Error(`Invalid Date: ${value}`);
      return this;
    },
  },
};