Adds Time#sunday method

activesupport/lib/active_support/core_ext/time/calculations.rb

@@ -189,6 +189,12 @@ def end_of_week(start_day = :monday)
   end
   alias :at_end_of_week :end_of_week
 
+  # Returns a new +Date+/+DateTime+ representing the end of this week. Week is
+  # assumed to start on a Monday. +DateTime+ objects have their time set to 23:59:59.
+  def sunday
+    end_of_week
+  end
+
   # Returns a new Time representing the start of the given day in the previous week (default is :monday).
   def prev_week(day = :monday)
     ago(1.week).beginning_of_week.since(DAYS_INTO_WEEK[day].day).change(:hour => 0)

railties/guides/source/active_support_core_extensions.textile

@@ -3455,6 +3455,7 @@ end_of_day
 beginning_of_week (at_beginning_of_week)
 end_of_week (at_end_of_week)
 monday
+sunday
 weeks_ago
 prev_week
 next_week