diff --git a/app/models/ruling_timer_temp.rb b/app/models/ruling_timer_temp.rb
index 2b1b448..15864e9 100644
--- a/app/models/ruling_timer_temp.rb
+++ b/app/models/ruling_timer_temp.rb
@@ -136,6 +136,15 @@ class RulingTimerTemp
     end
     return last_work_time
   end
+  def get_first_work_time
+    first_work_time = self.work_times.first
+    if first_work_time.nil?
+      first_work_time = DateTime.now.utc.new_offset(self.time_offset)
+    else
+      first_work_time = convert_datetime(first_work_time).new_offset(self.time_offset)
+    end
+    return first_work_time
+  end
   def check_and_store
     unless self.new_record?
       time_now = DateTime.now.utc
@@ -321,7 +330,7 @@ class RulingTimerTemp
         end
         ruling_timer_history.send("#{field_name}=",self.send(field_name))
       end
-      ruling_timer_history.date = self.get_last_work_time.new_offset(self.time_offset).strftime("%Y/%m/%d %w")
+      ruling_timer_history.date = self.get_first_work_time.new_offset(self.time_offset).strftime("%Y/%m/%d %w")
       ruling_timer_history.user = self.user
       ruling_timer_history.save
     end