division by zero

Clientes/models.py

@@ -1,6 +1,6 @@
 from django.db import models
 import datetime
-
+from django.db.models import Q
 
 class saldoModel(models.Model):
     saldo = models.IntegerField()
@@ -38,9 +38,37 @@ class Clientes(models.Model):
     Nombre = models.CharField(max_length=100)
     Activo = models.BooleanField(default=False)
     fecha_baja = models.DateField(blank=True,null=True)
-    
+    email = models.EmailField(max_length=254, blank=True)
+    conteo_mes = models.IntegerField(blank=True,null=True,default=0)
+    def timbres_X_MES(self, mes):
+
+        today = datetime.date.today()              
+        year  = today.year 
+        print('mesmesmesmesmes',mes)
+        if mes==None:
+            mes = today.month
+        dat = datetime.datetime(int(year),int(mes),1)    
+        if dat.month in (1,3,5,7,8,10,12):#31
+            
+            findate = dat  + datetime.timedelta(days=30)
+            findate += datetime.timedelta(days=0)
+        elif dat.month in (4,6,9,11):#30
+            
+            findate = dat  + datetime.timedelta(days=29)
+            findate += datetime.timedelta(days=0)
+        else:#28 or 29
+            
+            findate = dat  + datetime.timedelta(days=28)
+            findate += datetime.timedelta(days=0)        
+        print(f'dat {(dat)} fdate={findate}')    
+        cou = Timbres.objects.filter(rfcc=self.RFC, created_at__range=[dat,findate]).count()
+        print(cou)
+        self.conteo_mes =cou
+        self.save()
+        return cou
     @property
-    def timbres_mes_count(self):    
+    def timbres_mes_count(self): 
+
         today = datetime.date.today()
         month = today.month
         year  = today.year