diff --git a/pydicts/casts.py b/pydicts/casts.py
index d589915..e8a4212 100644
--- a/pydicts/casts.py
+++ b/pydicts/casts.py
@@ -357,6 +357,8 @@ def str2dtnaive(s, format):
             s=f"{date.today().year} {s}"
             return datetime.strptime(s, '%Y %b %d %H:%M:%S')
         if format=="JsIso": #2021-08-21T06:27:38.294
+            if s.endswith("Z"):
+                return None
             s=s.replace("T"," ")
             dtnaive=str2dtnaive(s,"%Y-%m-%d %H:%M:%S.")
             return dtnaive
@@ -379,6 +381,8 @@ def str2dtaware(s, format, tz_name='UTC'):
             dt=dt+timedelta(microseconds=micro)
             return dtaware_changes_tz(dt, tz_name)
         if format=="JsUtcIso": #2021-08-21T06:27:38.294Z
+            if not "Z" in s:
+                return None
             s=s.replace("T"," ").replace("Z","")
             dtnaive=str2dtnaive(s,"%Y-%m-%d %H:%M:%S.")
             dtaware_utc=dtnaive2dtaware(dtnaive, 'UTC')
diff --git a/pydicts/myjsonencoder.py b/pydicts/myjsonencoder.py
index 646638e..e2e7050 100644
--- a/pydicts/myjsonencoder.py
+++ b/pydicts/myjsonencoder.py
@@ -6,9 +6,9 @@
 
 # Forma en que debe parsearse los Decimals
 class DecimalsWay:
-    Decimal=1  #Uses a String with decimal to detect decimals
-    String=2
-    Float=3
+    DecimalString=1  #Uses a String with decimal to detect decimals "Decimal('12.122')"
+    String=2  #"12.122"
+    Float=3  # 12.122
 
 ## Usa
 class MyJSONEncoder(JSONEncoder):
@@ -98,7 +98,7 @@ def MyJSONEncoderDecimalsAsFloat_dumps(r, indent=4):
 
 def MyJSONEncoder_loads(s):
     def hooks_MyJSONEncoder(iter_value):
-        return hooks(iter_value, DecimalsWay.Decimal)
+        return hooks(iter_value, DecimalsWay.DecimalString)
     ##############################
     return loads(s, object_hook=hooks_MyJSONEncoder)
 
@@ -122,21 +122,16 @@ def hooks(iter_value, decimals_way):
     """
     
     def get_date(s):
-        try:
-            return date.fromisoformat(s)
-        except:
-            return None 
+            return casts.str2date(s)
             
     def get_dtaware(s):
         try:
-            print(s, casts.str2dtaware(s,"JsUtcIso"))
             return casts.str2dtaware(s,"JsUtcIso")
         except:
             return None 
 
     def get_dtnaive(s):
         try:
-            print(s, casts.str2dtnaive(s,"JsIso"))
             return casts.str2dtnaive(s,"JsIso")
         except:
             return None 
@@ -189,16 +184,17 @@ def get_bytes(s):
             
     def get_Decimal(s):
         try:
-            return eval(s)
+            return casts.str2decimal(s)
         except:
             return None
 
         
     def guess_cast(o, decimal_way):        
-        if decimal_way==DecimalsWay.Decimal:
-            r=get_Decimal(o)
-            if r is not None:
-                return  r
+        if decimal_way==DecimalsWay.DecimalString:
+            if o.__class__==str and o.startswith("Decimal("):
+                r=get_Decimal(o)
+                if r is not None:
+                    return  str(r)
 
         r=get_date(o)
         if r is not None:
diff --git a/pydicts/tests/test_casts.py b/pydicts/tests/test_casts.py
index 403ddea..c7d0b02 100644
--- a/pydicts/tests/test_casts.py
+++ b/pydicts/tests/test_casts.py
@@ -183,8 +183,9 @@ def test_time2str():
     assert casts.time2str(time_, "HH:MM:SS")=="09:05:54"
 
 def test_str2date():
-#    allowed=["YYYY-MM-DD", "DD/MM/YYYY", "DD.MM.YYYY", "DD/MM"]
-
+    assert casts.str2date(None)==None
+    assert casts.str2date("2023")==None
+    assert casts.str2date(2023)==None
     assert casts.str2date("2023-11-26")==date(2023, 11, 26)
     assert casts.str2date("2023-11-26", "YYYY-MM-DD")==date(2023, 11, 26)
     assert casts.str2date("26/11/2023", "DD/MM/YYYY")==date(2023, 11, 26)
@@ -199,6 +200,7 @@ def test_str2dtnaive():
 #    assert casts.str2dtnaive("20231126 1705", "%Y%m%d %H%M")==datetime(2023, 11, 26, 17, 5, 5)
     assert casts.str2dtnaive("202311261705", "%Y%m%d%H%M")==datetime(2023, 11, 26, 17, 5)
     assert casts.str2dtnaive("2023-11-26T17:05:05.123456", "JsIso")==datetime(2023, 11, 26, 17, 5, 5, 123456)
+    assert casts.str2dtnaive("2023-11-26T17:05:05.123456Z", "JsIso")==None
     assert casts.str2dtnaive("2023-11-26T17:05:05", "JsIso")==datetime(2023, 11, 26, 17, 5, 5)
 
 
@@ -206,7 +208,10 @@ def test_str2dtaware():
 #    allowed=["%Y-%m-%d %H:%M:%S%z","%Y-%m-%d %H:%M:%S.%z", "JsUtcIso"]
     #assert casts.str2dtaware("2023-11-26", "%Y-%m-%d")==datetime(2023, 11, 26, tzinfo=ZoneInfo('UTC'))
     #assert casts.str2dtaware("202311261705", "%Y%m%d%H%M")==datetime(2023, 11, 26, 17, 5)
+    
+    assert casts.str2dtaware("2023-11-26T17:05:05Z", "YYYY-mm-dd")==None
     assert casts.str2dtaware("2023-11-26T17:05:05Z", "JsUtcIso")==datetime(2023, 11, 26, 17, 5, 5, tzinfo=ZoneInfo('UTC'))
+    assert casts.str2dtaware("2023-11-26T17:05:05", "JsUtcIso")==None
 
 ### epoch is the time from 1,1,1970 in UTC
 ### return now(timezone(self.name))
diff --git a/pydicts/tests/test_myjsonencoder.py b/pydicts/tests/test_myjsonencoder.py
index 8d2bd49..9e71060 100644
--- a/pydicts/tests/test_myjsonencoder.py
+++ b/pydicts/tests/test_myjsonencoder.py
@@ -14,9 +14,13 @@
 d["Bytes"]=b"Byte array"
 d["Decimal"]=Decimal("12.12123414")
 
+
 def test_myjsonencoder():
+    print(d)
     json_string=myjsonencoder.MyJSONEncoder_dumps(d)
+    print("Antes",  json_string)
     json_=myjsonencoder.MyJSONEncoder_loads(json_string)
+    print("Despues", json_)
     assert json_["None"]==d["None"]
     assert json_["Integer"]==d["Integer"]
     assert json_["Float"]==d["Float"]
@@ -24,7 +28,7 @@ def test_myjsonencoder():
     assert json_["Datetime"]==d["Datetime"]
     assert json_["Datetime aware"]==d["Datetime aware"]
     assert json_["Bytes"]==d["Bytes"]
-    assert json_["Decimal"]==d["Decimal"]
+    assert json_["Decimal"]==repr(d["Decimal"])
 #    assert json_["Time"]==d["Time"]
 #    assert json_["Timedelta"]==d["Timedelta"]