diff --git a/app/models/act.rb b/app/models/act.rb
index c6173d3..87dea98 100644
--- a/app/models/act.rb
+++ b/app/models/act.rb
@@ -131,25 +131,25 @@ class Act
     statuses << {"name" => hidden_text, "classname" => "hidden"} if is_hidden?
     statuses
   end
-
-  def can_sign_up?
-    @time_now ||= Time.now
-    (self.sign_up && (self.sign_start_date.blank? || self.sign_start_date <= @time_now) && ( self.sign_end_date.blank? || self.sign_end_date >= @time_now )) rescue false
-  end
   
   def is_external_link?
     self.is_external_link && !self.external_link.blank?
   end
+
   def signup_show
-    @time_now ||= Time.now
-    if self.can_sign_up?
-      sign_up = ('<a href="'+ (self.is_external_link? ? self.external_link : OrbitHelper.url_to_show(self.to_param)) + '" target="_blank">' + I18n.t('act.sign_up') + '</a>').html_safe
-    elsif self.sign_up
-      sign_up = I18n.t('act.sign_up_not_open')
-    elsif (self.sign_start_date > @time_now rescue false)
-      sign_up = I18n.t('act.sign_up_not_yet')
+    time_now = Time.now
+    if self.sign_up
+      sign_start_date_checked = (self.sign_start_date.nil? || self.sign_start_date <= time_now)
+      sign_end_date_checked = (self.sign_end_date.nil? || self.sign_end_date >= time_now)
+      if sign_start_date_checked && sign_end_date_checked
+        sign_up_text = ('<a href="'+ (self.is_external_link? ? self.external_link : OrbitHelper.url_to_show(self.to_param)) + '" target="_blank">' + I18n.t('act.sign_up') + '</a>').html_safe
+      elsif !sign_start_date_checked
+        sign_up_text = I18n.t('act.sign_up_not_yet')
+      else
+        sign_up_text = I18n.t('act.sign_up_overdue')
+      end
     else
-      sign_up = I18n.t('act.sign_up_overdue')
+      sign_up_text = I18n.t('act.sign_up_not_open')
     end
   end