Add date to timestamp conversion test

spec/datagrid/filters/date_filter_spec.rb

@@ -171,14 +171,14 @@ def entry_dated(date)
     end
   end
 
-  it "should automatically reverse Array if first more than last" do
+  it "should automatically reverse if first more than last" do
     report = test_report(created_at: %w[2013-01-01 2012-01-01]) do
       scope  { Entry }
       filter(:created_at, :date, range: true)
     end
     expect(report.created_at).to eq([Date.new(2012, 0o1, 0o1), Date.new(2013, 0o1, 0o1)])
   end
-  it "should automatically reverse Array if first more than last" do
+  it "should automatically reverse if first more than last" do
     report = test_report(created_at: %w[2013-01-01 2012-01-01]) do
       scope  { Entry }
       filter(:created_at, :date, range: true)
@@ -204,4 +204,21 @@ def entry_dated(date)
       expect(report.filter_value_as_string(:created_at)).to eq("01/02/2012")
     end
   end
+
+  it "supports search by timestamp column" do
+    report = test_report(created_at: Date.today) do
+      scope {Entry}
+      filter(:created_at, :date)
+    end
+    e1 = Entry.create!(created_at: Date.yesterday + 23.hours)
+    e2 = Entry.create!(created_at: Date.today.to_time)
+    e3 = Entry.create!(created_at: Date.today + 12.hours)
+    e4 = Entry.create!(created_at: Date.today + 23.hours)
+    e5 = Entry.create!(created_at: Date.tomorrow)
+    expect(report.assets).to_not include(e1)
+    expect(report.assets).to include(e2)
+    expect(report.assets).to include(e3)
+    expect(report.assets).to include(e4)
+    expect(report.assets).to_not include(e5)
+  end
 end