momentjs Getting started with momentjs Calculating and manipulating dates

Example

If you have a moment object you can use add and substract to manipulate it or set any property of the time directly

 moment("2016-01-01").add(1, 'year').format('YYYY-MM-DD')
 // -> "2017-01-01"

Or use .day(), .month(), .year(), .seconds(), .milliseconds() to set those values directly. Note that the arguments passed are 0-indexed.

 moment("2016-01-01").month(4).day(5).format('YYYY-MM-DD')
// -> "2016-05-06"