Have enqueued_at time be nil for jobs that have yet to be enqueued (i.e., are scheduled).

lib/sidekiq/api.rb

@@ -312,7 +312,7 @@ module Sidekiq
     end
 
     def enqueued_at
-      Time.at(@item['enqueued_at'] || 0).utc
+      @item['enqueued_at'] ? Time.at(@item['enqueued_at']).utc : nil
     end
 
     def created_at

test/test_api.rb

@@ -207,6 +207,12 @@ class TestApi < Sidekiq::Test
       assert_equal 0, q.size
     end
 
+    it 'has no enqueued_at time for jobs enqueued in the future' do
+      job_id = ApiWorker.perform_in(100, 1, 'foo')
+      job = Sidekiq::ScheduledSet.new.find_job(job_id)
+      assert_nil job.enqueued_at
+    end
+
     it 'unwraps delayed jobs' do
       ApiWorker.delay.foo(1,2,3)
       q = Sidekiq::Queue.new

web/locales/en.yml

@@ -74,3 +74,4 @@ en: # <---- change this to your locale code
   QuietAll: Quiet All
   PollingInterval: Polling interval
   Plugins: Plugins
+  NotYetEnqueued: Not yet enqueued

web/views/_job_info.erb

@@ -34,7 +34,7 @@
       </tr>
       <tr>
         <th><%= t('Enqueued') %></th>
-        <td><%= relative_time(job.enqueued_at) %></td>
+        <td><%= (enqueued_at = job.enqueued_at) ? relative_time(enqueued_at) : t('NotYetEnqueued') %></td>
       </tr>
       <% unless retry_extra_items(job).empty? %>
         <tr>