diff --git a/lib/activerecord-bitemporal/scope.rb b/lib/activerecord-bitemporal/scope.rb
index 7cee4945..b45cb103 100644
--- a/lib/activerecord-bitemporal/scope.rb
+++ b/lib/activerecord-bitemporal/scope.rb
@@ -494,10 +494,25 @@ def _#{column}_#{op}(datetime,**)
       }
 
       # from <= valid_from AND valid_to <= to
-      scope :valid_allin, -> (from: nil, to: nil) {
-        ignore_valid_datetime
-          .tap { |relation| break relation.bitemporal_where_bind("valid_from", :gteq, from.in_time_zone.to_datetime) if from }
-          .tap { |relation| break relation.bitemporal_where_bind("valid_to", :lteq, to.in_time_zone.to_datetime) if to }
+      scope :valid_allin, -> (range = nil, from: nil, to: nil) {
+        return valid_allin(from..to) if range.nil?
+
+        relation = ignore_valid_datetime
+        begin_, end_ = range.begin, range.end
+
+        if begin_
+          relation = relation.bitemporal_where_bind("valid_from", :gteq, begin_.in_time_zone.to_datetime)
+        end
+
+        if end_
+          if range.exclude_end?
+            raise 'Range with excluding end is not supported'
+          else
+            relation = relation.bitemporal_where_bind("valid_to", :lteq, end_.in_time_zone.to_datetime)
+          end
+        end
+
+        relation
       }
     end
 
diff --git a/spec/activerecord-bitemporal/scopes_spec.rb b/spec/activerecord-bitemporal/scopes_spec.rb
index 129e22dd..21c58070 100644
--- a/spec/activerecord-bitemporal/scopes_spec.rb
+++ b/spec/activerecord-bitemporal/scopes_spec.rb
@@ -222,11 +222,72 @@ class EmployeeWithScope < Employee
         Time.zone = "Tokyo"
       end
       after { Time.zone = @old_time_zone }
-      let(:from) { "2019/1/20" }
-      let(:to) { "2019/1/30" }
-      subject { Employee.valid_allin(from: from, to: to).to_sql }
-      it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-19 15:00:00'/ }
-      it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-29 15:00:00'/ }
+
+      let(:_01_20) { "2019/1/20" }
+      let(:_01_30) { "2019/1/30" }
+
+      subject { relation.to_sql }
+
+      context "with from: _01_20, to: _01_30" do
+        let(:relation) { Employee.valid_allin(from: _01_20, to: _01_30) }
+
+        it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-19 15:00:00'/ }
+        it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-29 15:00:00'/ }
+      end
+
+      context "with from: _01_30, to: _01_20" do
+        let(:relation) { Employee.valid_allin(from: _01_30, to: _01_20) }
+
+        it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-29 15:00:00'/ }
+        it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-19 15:00:00'/ }
+      end
+
+      context "with from: _01_20" do
+        let(:relation) { Employee.valid_allin(from: _01_20) }
+
+        it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-19 15:00:00'/ }
+        it { is_expected.not_to match %r/"employees"."valid_to"/ }
+      end
+
+      context "with to: _01_30" do
+        let(:relation) { Employee.valid_allin(to: _01_30) }
+
+        it { is_expected.not_to match %r/"employees"."valid_from"/ }
+        it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-29 15:00:00'/ }
+      end
+
+      context "with (_01_20.._01_30)" do
+        let(:relation) { Employee.valid_allin(_01_20.._01_30) }
+
+        it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-19 15:00:00'/ }
+        it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-29 15:00:00'/ }
+      end
+
+      context "with (_01_20..)" do
+        let(:relation) { Employee.valid_allin(_01_20..) }
+
+        it { is_expected.to match %r/"employees"."valid_from" >= '2019-01-19 15:00:00'/ }
+        it { is_expected.not_to match %r/"employees"."valid_to"/ }
+      end
+
+      context "with (.._01_30)" do
+        let(:relation) { Employee.valid_allin(.._01_30) }
+
+        it { is_expected.not_to match %r/"employees"."valid_from"/ }
+        it { is_expected.to match %r/"employees"."valid_to" <= '2019-01-29 15:00:00'/ }
+      end
+
+      context "with (_01_20..._01_30)" do
+        let(:relation) { Employee.valid_allin(_01_20..._01_30) }
+
+        it { expect { subject }.to raise_error('Range with excluding end is not supported') }
+      end
+
+      context "with (..._01_30)" do
+        let(:relation) { Employee.valid_allin(..._01_30) }
+
+        it { expect { subject }.to raise_error('Range with excluding end is not supported') }
+      end
     end
 
     describe ".arel.to_sql" do