$ sudo npm install date.js
$ sudo npm install -g date.js

If want to update the date.js package execute the command as below,

$ sudo npm update date.js

Update package globally,

$ npm install -g date.js

Git clone:

$ sudo  git clone https://github.com/rektide/date.js.git

$ sudo  npm install -g ./date.js

date.js@0.3.2 /usr/lib/node_modules/date.js

How to remove date.js package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall date.js

Basic Information of date.js NPM Package: