next_week

If you want to do the reverse of this, e.g. go from a specific date and back to a certain day of the previous week, you can implement it like this: def last_week(day = :monday) days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2, :thursday => 3, :friday => 4, :saturday => 5, :sunday => 6} result = (self - 7).beginning_of_week + days_into_week[day] self.acts_like?(:time) ? result.change(:hour => 0) : result end

If you do not want to make your own method of this, but just want to do it in a regular chaining of date methods (like +Date.today.next_year.at_midnight+), you can do it like the following: (date - 7).next_week(:tuesday) # Tuesday, last week

Please note that you just need to subtract 7 if you want to move back a week. Only use these methods if you want to go to a specific day of the week.

If you want to implement last_week as posted by Mange, save it as:

==== lib/core_extensions.rb class Date def last_week(day = :monday) days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2, :thursday => 3, :friday => 4, :saturday => 5, :sunday => 6} result = (self - 7).beginning_of_week + days_into_week[day] self.acts_like?(:time) ? result.change(:hour => 0) : result end end

And add to:

==== config/environment.rb require 'core_extensions'