feat(data): Convert usage_date in customer's timezone

app/services/daily_usages/compute_service.rb

@@ -28,7 +28,7 @@ def call
         from_datetime: current_usage.from_datetime,
         to_datetime: current_usage.to_datetime,
         refreshed_at: timestamp,
-        usage_date: timestamp.to_date - 1.day
+        usage_date: date_in_timezone - 1.day
       )
 
       daily_usage.usage_diff = diff_usage(daily_usage)
@@ -74,8 +74,6 @@ def diff_usage(daily_usage)
     end
 
     def subscription_billing_day?
-      date_in_timezone = timestamp.in_time_zone(customer.applicable_timezone).to_date
-
       previous_billing_date_in_timezone = Subscriptions::DatesService
         .new_instance(subscription, timestamp, current_usage: true)
         .previous_beginning_of_period
@@ -84,5 +82,9 @@ def subscription_billing_day?
 
       date_in_timezone == previous_billing_date_in_timezone
     end
+
+    def date_in_timezone
+      @date_in_timezone ||= timestamp.in_time_zone(customer.applicable_timezone).to_date
+    end
   end
 end

spec/services/daily_usages/compute_service_spec.rb

@@ -27,7 +27,7 @@
           external_subscription_id: subscription.external_id,
           usage: Hash,
           usage_diff: Hash,
-          usage_date: timestamp.to_date - 1.day
+          usage_date: Date.parse("2024-10-21")
         )
         expect(daily_usage.refreshed_at).to match_datetime(timestamp)
         expect(daily_usage.from_datetime).to match_datetime(timestamp.beginning_of_month)
@@ -119,5 +119,18 @@
         expect(daily_usage.to_datetime).to match_datetime(subscription.terminated_at)
       end
     end
+
+    context "with customer timezone" do
+      let(:customer) { create(:customer, organization:, timezone: "Australia/Sydney") }
+      let(:timestamp) { Time.zone.parse("2024-10-21 15:05:00") }
+
+      it "creates a daily usage with expected usage_date" do
+        expect { compute_service.call }.to change(DailyUsage, :count).by(1)
+
+        daily_usage = DailyUsage.order(created_at: :asc).last
+        # Timestamp is 22 Oct 2024 02:05:00 AEDT
+        expect(daily_usage.usage_date).to eq(Date.parse("2024-10-21"))
+      end
+    end
   end
 end