diff --git a/app/services/json_generator.py b/app/services/json_generator.py
index ca2d726..be4e224 100644
--- a/app/services/json_generator.py
+++ b/app/services/json_generator.py
@@ -17,13 +17,16 @@ def _fmt_fecha(val) -> str:
     return s
 
 
+def _clean_time(s: str) -> str:
+    return s.replace(": ", ":").replace(" :", ":")
+
+
 def _fmt_datetime(val) -> str:
     if not val:
         return ""
     if hasattr(val, "strftime"):
-        return val.strftime("%d/%m/%Y %H:%M:%S")
-    # Eliminar espacios dentro de la hora ANTES de truncar ("06: 59: 28" → "06:59:28")
-    s = str(val).replace(": ", ":").replace(" :", ":")
+        return _clean_time(val.strftime("%d/%m/%Y %H:%M:%S"))
+    s = _clean_time(str(val))
     s = s[:19].replace("T", " ")
     parts = s.split(" ")
     if len(parts) == 2: