Reimplement DateTime#to_time since we do not always have activesuppor…

…t around

lib/integrity.rb

@@ -71,4 +71,13 @@ def self.app
 
     Integrity::App
   end
+
+  # DateTime#to_time copied from activesupport
+  def self.datetime_to_time(datetime)
+    if datetime.offset == 0
+      ::Time.utc(datetime.year, datetime.month, datetime.day, datetime.hour, datetime.min, datetime.sec)
+    else
+      raise ArgumentError, "Datetime with an offset (#{datetime.offset}) cannot be converted to Time"
+    end
+  end
 end

lib/integrity/build.rb

@@ -141,7 +141,8 @@ def human_status
 
     def human_duration
       return if pending? || building?
-      ChronicDuration.output((completed_at.to_time.to_i - started_at.to_time.to_i), :format => :micro)
+      delta = Integrity.datetime_to_time(completed_at).to_i - Integrity.datetime_to_time(started_at).to_i
+      ChronicDuration.output(delta, :format => :micro)
     end
 
   end