Once you have a
Moment, you may want to manipulate it in some way. There are a number of methods to help with this.
moment().add(7, 'days').subtract(1, 'months').year(2009).hours(0).minutes(0).seconds(0);
Note: It should be noted that moments are mutable. Calling any of the manipulation methods will change the original moment.
If you want to create a copy and manipulate it, you should use
moment#clone before manipulating the moment. More info on cloning.