created_at Time Scopes for Ruby on Rails

# Time Scopes
scope :today, -> { where(:created_at => Time.now.beginning_of_day..Time.now.end_of_day) }
scope :yesterday, -> { where(:created_at => 1.days.ago.beginning_of_day..1.days.ago.end_of_day) }
 
scope :this_week, -> { where(:created_at => Time.now.beginning_of_week..Time.now.end_of_week) }
scope :this_month, -> { where(:created_at => Time.now.beginning_of_month..Time.now.end_of_month) }
scope :this_year, -> { where(:created_at => Time.now.beginning_of_year..Time.now.end_of_year) }
 
scope :last_hour, -> { where(:created_at => 1.hour.ago..Time.now) }
scope :last_week, -> { where(:created_at => 1.weeks.ago.beginning_of_week..1.weeks.ago.end_of_week) }
scope :last_month, -> { where(:created_at => 1.months.ago.beginning_of_month..1.months.ago.end_of_month) }
scope :last_year, -> { where(:created_at => 1.years.ago.beginning_of_year..1.years.ago.end_of_year) }