to add month to date (or any other time)

I want to increase date to 12 months for example:

var date = Date()

print(date)

var dateComponent = DateComponents()

dateComponent.month = 1

date = Calendar.current.date(byAdding: .month, value: 12, to: date)!

print(date)

var date = Date()

print(date)

var dateComponent = DateComponents()

dateComponent.month = 1

date = Calendar.current.date(byAdding: .month, value: 12, to: date)!

print(date)

the idea from http://swiftdeveloperblog.com/code-examples/add-days-months-or-years-to-current-date-in-swift/