Add days_to_keep_date

tubesync/sync/models.py

@@ -460,6 +460,14 @@ class Source(models.Model):
         else:
             return False
 
+    @property
+    def days_to_keep_date(self):
+        delta = self.days_to_keep
+        if delta > 0:
+            return timezone.now() - timedelta(days=delta)
+        else:
+            return False
+
     @property
     def extension(self):
         '''