diff --git a/app/models/choice.rb b/app/models/choice.rb
index 71d419b..12bd0af 100644
--- a/app/models/choice.rb
+++ b/app/models/choice.rb
@@ -117,7 +117,7 @@ class Choice < ActiveRecord::Base
     return if previous_choices.empty?
     inserts = []
 
-    timestring = Time.now.to_s(:db) #isn't rails awesome?
+    timestring = Time.now.utc.to_s(:db) #isn't rails awesome?
 
     #add prompts with this choice on the left
     previous_choices.each do |r|
diff --git a/app/models/question.rb b/app/models/question.rb
index 30d3632..94af834 100644
--- a/app/models/question.rb
+++ b/app/models/question.rb
@@ -542,11 +542,11 @@ class Question < ActiveRecord::Base
   end
 
   def record_prompt_cache_miss
-    $redis.incr(self.pq_key + "_" + Time.now.to_date.to_s + "_"+ "misses")
+    $redis.incr(self.pq_key + "_" + Time.now.utc.to_date.to_s + "_"+ "misses")
   end
 
   def record_prompt_cache_hit
-    $redis.incr(self.pq_key + "_" + Time.now.to_date.to_s + "_"+ "hits")
+    $redis.incr(self.pq_key + "_" + Time.now.utc.to_date.to_s + "_"+ "hits")
   end
 
   def get_prompt_cache_misses(date)
diff --git a/lib/tasks/test_api.rake b/lib/tasks/test_api.rake
index 38894df..47327c4 100644
--- a/lib/tasks/test_api.rake
+++ b/lib/tasks/test_api.rake
@@ -362,12 +362,13 @@ namespace :test_api do
       success_message = "At least 90% of prompts on catchup algorithm questions were served from cache\n" 
       return [success_message, false] unless question.uses_catchup?
 
-      misses = question.get_prompt_cache_misses(Date.yesterday).to_i
-      hits = question.get_prompt_cache_hits(Date.yesterday).to_i
+      yesterday = Time.now.utc.yesterday.to_date
+      misses = question.get_prompt_cache_misses(yesterday).to_i
+      hits = question.get_prompt_cache_hits(yesterday).to_i
 
-      question.expire_prompt_cache_tracking_keys(Date.yesterday)
+      question.expire_prompt_cache_tracking_keys(yesterday)
 
-      yesterday_appearances = question.appearances.count(:conditions => ['created_at >= ? AND created_at < ?', Time.now.yesterday.midnight.utc, Time.now.midnight.utc])
+      yesterday_appearances = question.appearances.count(:conditions => ['created_at >= ? AND created_at < ?', Time.now.utc.yesterday.midnight, Time.now.utc.midnight])
 
       if misses + hits != yesterday_appearances
         error_message += "Error! Question #{question.id} isn't tracking prompt cache hits and misses accurately! Expected #{yesterday_appearances}, Actual: #{misses+hits}, Hits: #{hits}, Misses: #{misses}\n"
--
libgit2 0.21.2