Instead of modifying the native Date.prototype, Moment.js creates a wrapper for the Date object. To get this wrapper object, simply call moment() with one of the supported input types.

The Moment prototype is exposed through moment.fn. If you want to add your own functions, that is where you would put them.

For ease of reference, any method on the Moment.prototype will be referenced in the docs as moment#method. So Moment.prototype.format == moment.fn.format == moment#format.