diff --git a/paramecio2/libraries/datetime.py b/paramecio2/libraries/datetime.py
index db2683e..9ad9703 100644
--- a/paramecio2/libraries/datetime.py
+++ b/paramecio2/libraries/datetime.py
@@ -217,7 +217,7 @@ def obtain_timestamp(timeform):
 
 # timestamp is gmt time, convert in normal time
 
-def timestamp_to_datetime(timestamp):
+def timestamp_to_datetime(timestamp, sql_format_time=sql_format_time):
     
     """Turn datetime in YYYYMMDDHHmmss format. 
     
@@ -233,7 +233,7 @@ def timestamp_to_datetime(timestamp):
 
 # Get a utc timestamp and convert to local
 
-def timestamp_to_datetime_local(timestamp, tz=''):
+def timestamp_to_datetime_local(timestamp, tz='', sql_format_time=sql_format_time):
     """Get a utc timestamp and convert to timezone datetime in YYYYMMDDHHmmss format. 
     
     Args:
diff --git a/paramecio2/libraries/db/extrafields/jsonfield.py b/paramecio2/libraries/db/extrafields/jsonfield.py
new file mode 100644
index 0000000..84eb3eb
--- /dev/null
+++ b/paramecio2/libraries/db/extrafields/jsonfield.py
@@ -0,0 +1,84 @@
+from paramecio2.libraries.db.webmodel import WebModel, PhangoField
+try:
+    
+    import ujson as json
+except:
+    import json
+
+class JsonField(PhangoField):
+    
+    def __init__(self, name, field_type, required=False):
+        
+        super().__init__(name, required)
+        
+        self.field_type=field_type
+    
+        self.error_default='Sorry, the json dict is invalid'
+
+        self.set_default='NOT NULL'
+    
+    def check(self, value):
+        
+        if type(value).__name__=='str':
+            try:
+                
+                value=json.loads(value)
+                
+            except json.JSONDecodeError:
+                
+                value={}
+                self.error=True
+                self.txt_error=self.error_default
+                
+        elif type(value).__name__!='dict':
+            
+            value={}
+            self.error=True
+            self.txt_error=self.error_default
+            
+        for k,v in value.items():
+            
+            value[k]=self.field_type.check(v)
+            
+        final_value=json.dumps(value)
+        
+        #final_value=WebModel.escape_sql(final_value)
+        
+        return final_value
+
+    def get_type_sql(self):
+
+        return 'LONGTEXT '+self.set_default
+    
+    def show_formatted(self, value):
+        
+        return ", ".join(value)
+
+# You need check the values previously.     
+
+class JsonValueField(PhangoField):
+    
+    def __init__(self, name, required=False):
+        
+        super().__init__(name, required)
+    
+        self.error_default='Sorry, the json dict is invalid'
+
+        #self.set_default='NOT NULL'
+    
+    def get_type_sql(self):
+
+        return 'JSON'
+    
+    def check(self, value):
+    
+        try:
+            final_value=json.dumps(value)
+        
+        except json.JSONDecodeError:
+                
+            value={}
+            self.error=True
+            self.txt_error=self.error_default            
+        
+        return final_value
diff --git a/paramecio2/modules/admin/media/css/admin.css b/paramecio2/modules/admin/media/css/admin.css
index 92327c3..06d4212 100644
--- a/paramecio2/modules/admin/media/css/admin.css
+++ b/paramecio2/modules/admin/media/css/admin.css
@@ -814,6 +814,65 @@ a.form_button_tab:hover
 
 }
 
+/* Loading */
+/* <div class="lds-dual-ring"></div> */
+
+.lds-dual-ring {
+  display: inline-block;
+  width: 80px;
+  height: 80px;
+}
+.lds-dual-ring:after {
+  content: " ";
+  display: block;
+  width: 64px;
+  height: 64px;
+  margin: 8px;
+  border-radius: 50%;
+  border: 6px solid #000;
+  border-color: #000 transparent #000 transparent;
+  animation: lds-dual-ring 1.2s linear infinite;
+}
+@keyframes lds-dual-ring {
+  0% {
+    transform: rotate(0deg);
+  }
+  100% {
+    transform: rotate(360deg);
+  }
+}
+
+/* Block screen while loading */
+
+#layer_loading {
+
+    z-index:50000;
+    /*background-color:rgba(0,0,0,0.4);*/
+    /*opacity:0.5;*/
+    position:absolute;
+    width:100%;
+    height:100%;
+    overflow:auto;
+
+    
+}
+
+#container_loading {
+
+    z-index:50001;
+    overflow:auto;
+   /* border: solid #fbfbfb 4px;*/
+    position:absolute;
+    overflow:visible;
+    width:100%;
+    height:100%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+}
+
+
 /* Media queries */
 
 @media only screen and (max-width: 800px) {
diff --git a/paramecio2/modules/admin/templates/dashboard.phtml b/paramecio2/modules/admin/templates/dashboard.phtml
index 033a9af..5265fac 100644
--- a/paramecio2/modules/admin/templates/dashboard.phtml
+++ b/paramecio2/modules/admin/templates/dashboard.phtml
@@ -21,6 +21,7 @@ ${load_js()|n}
 </%block>
 </head>
 <body>
+<div id="layer_loading" style="display:none;"><div id="container_loading"><div class="lds-dual-ring"></div></div></div>
 <div id="languages_general">
 </div>
 <div id="logout">
@@ -40,7 +41,7 @@ ${load_js()|n}
                 <%
                 
                 from paramecio2.libraries.config_admin import config_admin
-
+    
                 %>
                 % for admin in config_admin:
 
@@ -53,7 +54,7 @@ ${load_js()|n}
                     % if len(admin)==3:
                     <%
                     
-                    if admin[2]+'/'==path_module:
+                    if admin[2]==path_module:
                         class_selected='selected_menu'
                     
                     %>
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29