exact date spans

>= AND <= is bad
>= AND < is good

https://wiki.postgresql.org/wiki/Don't_Do_This#Don.27t_use_BETWEEN_.28especially_with_timestamps.29

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

@@ -87,6 +87,10 @@ def end_of_day
   end
   alias :at_end_of_day :end_of_day
 
+  def end_of_day_threshold
+    beginning_of_day.advance(days: 1)
+  end
+
   def plus_with_duration(other) # :nodoc:
     if ActiveSupport::Duration === other
       other.since(self)

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

@@ -157,6 +157,11 @@ def end_of_quarter
     end
     alias :at_end_of_quarter :end_of_quarter
 
+    def end_of_quarter_threshold
+      last_quarter_month = month + (12 - month) % 3
+      beginning_of_month.change(month: last_quarter_month).end_of_month_threshold
+    end
+
     # Returns the quarter for a date/time.
     #
     #   Date.new(2010, 1, 31).quarter  # => 1
@@ -285,6 +290,10 @@ def end_of_week(start_day = Date.beginning_of_week)
     end
     alias :at_end_of_week :end_of_week
 
+    def end_of_week_threshold(start_day = Date.beginning_of_week)
+      days_since(6 - days_to_week_start(start_day)).advance(days: 1).beginning_of_day
+    end
+
     # Returns Sunday of this week assuming that week starts on Monday.
     # +DateTime+ objects have their time set to 23:59:59.
     def sunday
@@ -299,37 +308,46 @@ def end_of_month
     end
     alias :at_end_of_month :end_of_month
 
+    def end_of_month_threshold
+      last_day = ::Time.days_in_month(month, year)
+      days_since(last_day - day).advance(days: 1).beginning_of_day
+    end
+
     # Returns a new date/time representing the end of the year.
     # DateTime objects will have a time set to 23:59:59.
     def end_of_year
       change(month: 12).end_of_month
     end
     alias :at_end_of_year :end_of_year
 
+    def end_of_year_threshold
+      change(month: 12).end_of_month_threshold
+    end
+
     # Returns a Range representing the whole day of the current date/time.
     def all_day
-      beginning_of_day..end_of_day
+      beginning_of_day...end_of_day_threshold
     end
 
     # Returns a Range representing the whole week of the current date/time.
     # Week starts on start_day, default is <tt>Date.beginning_of_week</tt> or <tt>config.beginning_of_week</tt> when set.
     def all_week(start_day = Date.beginning_of_week)
-      beginning_of_week(start_day)..end_of_week(start_day)
+      beginning_of_week(start_day)...end_of_week_threshold(start_day)
     end
 
     # Returns a Range representing the whole month of the current date/time.
     def all_month
-      beginning_of_month..end_of_month
+      beginning_of_month...end_of_month_threshold
     end
 
     # Returns a Range representing the whole quarter of the current date/time.
     def all_quarter
-      beginning_of_quarter..end_of_quarter
+      beginning_of_quarter...end_of_quarter_threshold
     end
 
     # Returns a Range representing the whole year of the current date/time.
     def all_year
-      beginning_of_year..end_of_year
+      beginning_of_year...end_of_year_threshold
     end
 
     # Returns a new date/time representing the next occurrence of the specified day of week.

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

@@ -142,6 +142,10 @@ def end_of_day
   end
   alias :at_end_of_day :end_of_day
 
+  def end_of_day_threshold
+    change(hour: 0, min: 0, sec: 0, usec: 0).advance(days: 1)
+  end
+
   # Returns a new DateTime representing the start of the hour (hh:00:00).
   def beginning_of_hour
     change(min: 0)

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

@@ -251,6 +251,15 @@ def end_of_day
   end
   alias :at_end_of_day :end_of_day
 
+  def end_of_day_threshold
+    change(
+      hour: 0,
+      min: 0,
+      sec: 0,
+      usec: 0
+    ).advance(days: 1)
+  end
+
   # Returns a new Time representing the start of the hour (x:00)
   def beginning_of_hour
     change(min: 0)

activesupport/test/core_ext/date_ext_test.rb

@@ -284,36 +284,36 @@ def test_end_of_day_when_zone_is_set
 
   def test_all_day
     beginning_of_day = Time.local(2011, 6, 7, 0, 0, 0)
-    end_of_day = Time.local(2011, 6, 7, 23, 59, 59, Rational(999999999, 1000))
-    assert_equal beginning_of_day..end_of_day, Date.new(2011, 6, 7).all_day
+    beginning_of_next_day = Time.local(2011, 6, 8, 0, 0, 0)
+    assert_equal beginning_of_day...beginning_of_next_day, Date.new(2011, 6, 7).all_day
   end
 
   def test_all_day_when_zone_is_set
     zone = ActiveSupport::TimeZone["Hawaii"]
     with_env_tz "UTC" do
       with_tz_default zone do
         beginning_of_day = zone.local(2011, 6, 7, 0, 0, 0)
-        end_of_day = zone.local(2011, 6, 7, 23, 59, 59, Rational(999999999, 1000))
-        assert_equal beginning_of_day..end_of_day, Date.new(2011, 6, 7).all_day
+        beginning_of_next_day = zone.local(2011, 6, 8, 0, 0, 0)
+        assert_equal beginning_of_day...beginning_of_next_day, Date.new(2011, 6, 7).all_day
       end
     end
   end
 
   def test_all_week
-    assert_equal Date.new(2011, 6, 6)..Date.new(2011, 6, 12), Date.new(2011, 6, 7).all_week
-    assert_equal Date.new(2011, 6, 5)..Date.new(2011, 6, 11), Date.new(2011, 6, 7).all_week(:sunday)
+    assert_equal Date.new(2011, 6, 6)...Date.new(2011, 6, 13), Date.new(2011, 6, 7).all_week
+    assert_equal Date.new(2011, 6, 5)...Date.new(2011, 6, 12), Date.new(2011, 6, 7).all_week(:sunday)
   end
 
   def test_all_month
-    assert_equal Date.new(2011, 6, 1)..Date.new(2011, 6, 30), Date.new(2011, 6, 7).all_month
+    assert_equal Date.new(2011, 6, 1)...Date.new(2011, 7, 1), Date.new(2011, 6, 7).all_month
   end
 
   def test_all_quarter
-    assert_equal Date.new(2011, 4, 1)..Date.new(2011, 6, 30), Date.new(2011, 6, 7).all_quarter
+    assert_equal Date.new(2011, 4, 1)...Date.new(2011, 7, 1), Date.new(2011, 6, 7).all_quarter
   end
 
   def test_all_year
-    assert_equal Date.new(2011, 1, 1)..Date.new(2011, 12, 31), Date.new(2011, 6, 7).all_year
+    assert_equal Date.new(2011, 1, 1)...Date.new(2012, 1, 1), Date.new(2011, 6, 7).all_year
   end
 
   def test_xmlschema

activesupport/test/core_ext/time_ext_test.rb

@@ -1252,32 +1252,32 @@ def test_case_equality
   end
 
   def test_all_day
-    assert_equal Time.local(2011, 6, 7, 0, 0, 0)..Time.local(2011, 6, 7, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_day
+    assert_equal Time.local(2011, 6, 7, 0, 0, 0)...Time.local(2011, 6, 8, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_day
   end
 
   def test_all_day_with_timezone
     beginning_of_day = ActiveSupport::TimeWithZone.new(nil, ActiveSupport::TimeZone["Hawaii"], Time.local(2011, 6, 7, 0, 0, 0))
-    end_of_day = ActiveSupport::TimeWithZone.new(nil, ActiveSupport::TimeZone["Hawaii"], Time.local(2011, 6, 7, 23, 59, 59, Rational(999999999, 1000)))
+    beginning_of_next_day = ActiveSupport::TimeWithZone.new(nil, ActiveSupport::TimeZone["Hawaii"], Time.local(2011, 6, 8, 0, 0, 0))
 
     assert_equal beginning_of_day, ActiveSupport::TimeWithZone.new(Time.local(2011, 6, 7, 10, 10, 10), ActiveSupport::TimeZone["Hawaii"]).all_day.begin
-    assert_equal end_of_day, ActiveSupport::TimeWithZone.new(Time.local(2011, 6, 7, 10, 10, 10), ActiveSupport::TimeZone["Hawaii"]).all_day.end
+    assert_equal beginning_of_next_day, ActiveSupport::TimeWithZone.new(Time.local(2011, 6, 7, 10, 10, 10), ActiveSupport::TimeZone["Hawaii"]).all_day.end
   end
 
   def test_all_week
-    assert_equal Time.local(2011, 6, 6, 0, 0, 0)..Time.local(2011, 6, 12, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_week
-    assert_equal Time.local(2011, 6, 5, 0, 0, 0)..Time.local(2011, 6, 11, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_week(:sunday)
+    assert_equal Time.local(2011, 6, 6, 0, 0, 0)...Time.local(2011, 6, 13, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_week
+    assert_equal Time.local(2011, 6, 5, 0, 0, 0)...Time.local(2011, 6, 12, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_week(:sunday)
   end
 
   def test_all_month
-    assert_equal Time.local(2011, 6, 1, 0, 0, 0)..Time.local(2011, 6, 30, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_month
+    assert_equal Time.local(2011, 6, 1, 0, 0, 0)...Time.local(2011, 7, 1, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_month
   end
 
   def test_all_quarter
-    assert_equal Time.local(2011, 4, 1, 0, 0, 0)..Time.local(2011, 6, 30, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_quarter
+    assert_equal Time.local(2011, 4, 1, 0, 0, 0)...Time.local(2011, 7, 1, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_quarter
   end
 
   def test_all_year
-    assert_equal Time.local(2011, 1, 1, 0, 0, 0)..Time.local(2011, 12, 31, 23, 59, 59, Rational(999999999, 1000)), Time.local(2011, 6, 7, 10, 10, 10).all_year
+    assert_equal Time.local(2011, 1, 1, 0, 0, 0)...Time.local(2012, 1, 1, 0, 0, 0), Time.local(2011, 6, 7, 10, 10, 10).all_year
   end
 
   def test_rfc3339_parse