[ruby-on-rails] How to add 10 days to current time in Rails

I tried doing something like

Time.now + 5.days

but that doesn't work, even though I vaguely remember seeing, and being very impressed, with being able to do something like 2.years etc.

How do I do that in Rails 3?

This definitely works and I use this wherever I need to add days to the current date:

Date.today + 5

Some other options, just for reference

-10.days.ago
# Available in Rails 4
DateTime.now.days_ago(-10)

Just list out all options I know:

[1] Time.now + 10.days
[2] 10.days.from_now
[3] -10.days.ago
[4] DateTime.now.days_ago(-10)
[5] Date.today + 10

So now, what is the difference between them if we care about the timezone:

• [1, 4] With system timezone
• [2, 3] With config timezone of your Rails app
• [5] Date only no time included in result

days, years, etc., are part of Active Support, So this won't work in irb, but it should work in rails console.

Try this on Ruby. It will return a new date/time the specified number of days in the future

DateTime.now.days_since(10)

Try this on Rails

Time.new + 10.days 

Try this on Ruby

require 'date'
DateTime.now.next_day(10).to_time