How to add 1 month to a DateTime variable?

Created Mar 16, 2016 Edited Mar 16, 2016

Viewed 5717

I have a Subscription model. In my subscriptions table I have a DateTime column called expires_at.

For example:

expires_at: "2013-07-03 08:00:26"

I need to add 30 days more. Which method do I need to use for this?

ruby-on-rails ruby