Check if DateTime value is today, tomorrow or later

Here are some useful ways to achieve it:

datetime = DateTime.now  => Sun, 26 Oct 2014 21:00:00

datetime.today? # => true
datetime.to_date.past? # => false (only based on date)
datetime.to_date.future? # => false  (only based on date)

datetime.to_date == Date.tomorrow # => false
datetime.to_date == Date.yesterday # => false