diff --git a/Clientes/models.py b/Clientes/models.py
index 43410bb..bc75bbd 100644
--- a/Clientes/models.py
+++ b/Clientes/models.py
@@ -45,9 +45,9 @@ class Clientes(models.Model):
     conteo_mes = models.IntegerField(blank=True,null=True,default=0)
     def timbres_X_MES(self, mes=None, year=None, PAC=None):
         today = datetime.date.today()
-        if year is None:
+        if not year:
             year  = today.year        
-        if mes==None:
+        if not mes:
             mes = today.month
         
         dat = datetime.datetime(int(year),int(mes),1)
diff --git a/Clientes/views.py b/Clientes/views.py
index da00bd9..e86cb33 100644
--- a/Clientes/views.py
+++ b/Clientes/views.py
@@ -343,7 +343,7 @@ def export_Excel(request):
     else:
         objeto_a_trabajar = Clientes.objects.all()
         for i,ii in enumerate(objeto_a_trabajar):
-            ii.timbres_X_MES(mes=mes )
+            ii.timbres_X_MES(mes=mes,year=year )
 
     wb = Workbook()
     ws = wb.active