diff --git a/source/sat/util.py b/source/sat/util.py
index e4f64dc..c3b87f2 100644
--- a/source/sat/util.py
+++ b/source/sat/util.py
@@ -129,9 +129,9 @@ def _to_date(str_date, end=False):
     try:
         parts = str_date.split('-')
         if end:
-            dt = datetime(parts[0], parts[1], parts[2], 23, 59, 59)
+            dt = datetime(int(parts[0]), int(parts[1]), int(parts[2]), 23, 59, 59)
         else:
-            dt = datetime(parts[0], parts[1], parts[2], 0, 0, 0)
+            dt = datetime(int(parts[0]), int(parts[1]), int(parts[2]), 0, 0, 0)
     except Exception as e:
         error = 'Fecha inválida'