diff --git a/app/labor/timeframer.rb b/app/labor/timeframer.rb
index 4b7130768..9a9b40f82 100644
--- a/app/labor/timeframer.rb
+++ b/app/labor/timeframer.rb
@@ -2,21 +2,25 @@ class Timeframer
   attr_accessor :timeframe
 
   LATEST_TIMEFRAME = "latest".freeze
-
-  FILTER_TIMEFRAMES = {
-    "infinity" => 5.years.ago,
-    "year" => 1.year.ago,
-    "month" => 1.month.ago,
-    "week" => 1.week.ago
-  }.freeze
-
-  DATETIMES = FILTER_TIMEFRAMES.merge(LATEST_TIMEFRAME: LATEST_TIMEFRAME).freeze
+  FILTER_TIMEFRAMES = %w[infinity year month week].freeze
 
   def initialize(timeframe)
     @timeframe = timeframe
   end
 
   def datetime
-    DATETIMES[timeframe]
+    datetimes[timeframe]
+  end
+
+  private
+
+  def datetimes
+    @datetimes ||= {
+      infinity: 5.years.ago,
+      year: 1.year.ago,
+      month: 1.month.ago,
+      week: 1.week.ago,
+      LATEST_TIMEFRAME: LATEST_TIMEFRAME
+    }.with_indifferent_access
   end
 end
diff --git a/spec/labor/timeframer_spec.rb b/spec/labor/timeframer_spec.rb
new file mode 100644
index 000000000..0ebfd5ce3
--- /dev/null
+++ b/spec/labor/timeframer_spec.rb
@@ -0,0 +1,31 @@
+require "rails_helper"
+
+RSpec.describe Timeframer, type: :labor do
+  it "sets timeframe for week to 1 week ago" do
+    Timecop.freeze(Time.current) do
+      timeframer = described_class.new("week")
+      expect(timeframer.datetime).to eq(1.week.ago)
+    end
+  end
+
+  it "sets timeframe for month to 1 month ago" do
+    Timecop.freeze(Time.current) do
+      timeframer = described_class.new("month")
+      expect(timeframer.datetime).to eq(1.month.ago)
+    end
+  end
+
+  it "sets timeframe for year to 1 year ago" do
+    Timecop.freeze(Time.current) do
+      timeframer = described_class.new("year")
+      expect(timeframer.datetime).to eq(1.year.ago)
+    end
+  end
+
+  it "sets timeframe for infinity to 5 years ago" do
+    Timecop.freeze(Time.current) do
+      timeframer = described_class.new("infinity")
+      expect(timeframer.datetime).to eq(5.years.ago)
+    end
+  end
+end