date-faker

Package overriding what the now ( new Date(), Date.now() ) is in JS. It allows to manually change current date with moment.js like syntax.

installation

Install via npm:

npm install date-faker

Import to module:

• ESM:

import { dateFaker } from 'date-faker';

• CommonJS:

var { dateFaker } = require('date-faker');

usage

Methods:

• add(value, unit): changes date relatively to the current (original) by one specific unit only.

  • value a number indicating how much the current date should be changed;

  • unit string representing a unit for a change, valid units are: 'year' | 'month' | 'day' | 'hour' | 'minute' | 'second' | 'millisecond';

    dateFaker.add(1, 'day');
    

• add(configObject): changes date relatively to the current (original), several shift units can be used.

  • configObject object used for shifting the date. Valid property names are: 'year' | 'month' | 'day' | 'hour' | 'minute' | 'second' | 'millisecond'. All of then should be of type number, indicating the shift value, .

    dateFaker.add({ year: 1, month: -2, day: 3 });
    

• addAndReset(value, unit) or addAndReset(configObject): accept the same parameters as add methods described above. The difference is that callingaddAndReset method will fake only the first call of new Date(). All the next calls will return the original, unchanged date.

  ```
  dateFaker.addAndReset({ day: 1 });
  const fakedDate = new Date(); // returns tomorrow`s date and resets original date on 'Date' object;
  
  const originalDate = new Date(); // returns current date;
  
  // the same could be accomplished with
  
  dateFaker.add({ day: 1 });
  const fakedDate = new Date(); // returns tomorrow`s date.
  dateFaker.reset(); // resets the faker.
  
  const originalDate = new Date(); // returns current date;
  ```
  

  In methods above shift values can be either positive or negative numbers, for adding or substracting the date.

• set(value): set specific date.

  • value can be of type Date or string. String should be formatted YYYY/MM/DD / YYYY-MM-DD / ISO String.

    dateFaker.set('2019/01/24');
    

• reset(): restores Date original behaviour

  dateFaker.reset();
  

example

Running below command changes current date to be tomorrow.

new Date(); // standard behaviour: 2020-02-20

dateFaker.add(1, 'day');

new Date(); // faked date: 2020-02-21

configuration object can be used to shift the date.

new Date(); // standard behaviour: 2020-02-20

dateFaker.add({ year: 1, month: 2, day: 3 });

new Date(); // faked date: 2021-04-23

going back in time

new Date(); // standard behaviour: 2020-02-20

dateFaker.add(-1, 'month');

new Date(); // faked date: 2020-01-20

setting specific date

new Date(); // standard behaviour: 2020-02-20

dateFaker.set('2019/01/24');

new Date(); // faked date: 2019-01-24

changelog

ver. 1.3.0:

• 'addAndReset' method added.