diff --git a/addons/base/static/src/js/chrome.js b/addons/base/static/src/js/chrome.js
index 7c768d8f09c..14577c9d0ab 100644
--- a/addons/base/static/src/js/chrome.js
+++ b/addons/base/static/src/js/chrome.js
@@ -71,7 +71,10 @@ openerp.base.KeyNotFound = openerp.base.NotFound.extend(
      * @param {String} key the key which could not be found
      */
     init: function (key) {
-        self.key = key;
+        this.key = key;
+    },
+    toString: function () {
+        return "The key " + this.key + " was not found";
     }
 });
 openerp.base.ObjectNotFound = openerp.base.NotFound.extend(
@@ -85,7 +88,10 @@ openerp.base.ObjectNotFound = openerp.base.NotFound.extend(
      * @param {String} path the invalid object path
      */
     init: function (path) {
-        self.path = path;
+        this.path = path;
+    },
+    toString: function () {
+        return "Could not find any object of path " + this.path;
     }
 });
 openerp.base.Registry = Class.extend(
diff --git a/addons/base/static/src/js/search.js b/addons/base/static/src/js/search.js
index 52c501bcc77..5d6b175ac88 100644
--- a/addons/base/static/src/js/search.js
+++ b/addons/base/static/src/js/search.js
@@ -371,7 +371,7 @@ openerp.base.search.ExtendedSearch = openerp.base.BaseWidget.extend({
         this._super(parent);
         this.fields = fields;
     },
-    add_group: function(group) {
+    add_group: function() {
         var group = new openerp.base.search.ExtendedSearchGroup(this, this.fields);
         var render = group.render({});
         this.$element.find('.searchview_extended_groups_list').append(render);
@@ -382,10 +382,8 @@ openerp.base.search.ExtendedSearch = openerp.base.BaseWidget.extend({
         var _this = this;
         openerp.base.search.add_expand_listener(this.$element);
         this.add_group();
-        this.$element.find('.searchview_extended_add_group').click(function (e) {
+        this.$element.find('.searchview_extended_add_group').click(function () {
             _this.add_group();
-            e.stopPropagation();
-            e.preventDefault();
         });
     },
     get_context: function() {
@@ -395,9 +393,8 @@ openerp.base.search.ExtendedSearch = openerp.base.BaseWidget.extend({
         if(this.$element.hasClass("folded")) {
             return null;
         }
-        var domain = _.reduce(this.children,
-                function(mem, x) { return mem.concat(x.get_domain());}, []);
-        return domain;
+        return _.reduce(this.children,
+            function(mem, x) { return mem.concat(x.get_domain());}, []);
     }
 });
 
@@ -418,16 +415,12 @@ openerp.base.search.ExtendedSearchGroup = openerp.base.BaseWidget.extend({
         this._super();
         var _this = this;
         this.add_prop();
-        this.$element.find('.searchview_extended_add_proposition').click(function (e) {
+        this.$element.find('.searchview_extended_add_proposition').click(function () {
             _this.add_prop();
-            e.stopPropagation();
-            e.preventDefault();
         });
         var delete_btn = this.$element.find('.searchview_extended_delete_group');
         delete_btn.click(function (e) {
             _this.stop();
-            e.stopPropagation();
-            e.preventDefault();
         });
     },
     get_domain: function() {
@@ -436,30 +429,16 @@ openerp.base.search.ExtendedSearchGroup = openerp.base.BaseWidget.extend({
         }).compact().value();
         var choice = this.$element.find(".searchview_extended_group_choice").val();
         var op = choice == "all" ? "&" : "|";
-        var domain = [].concat(choice == "none" ? ['!'] : [],
-                _.map(_.range(_.max([0,props.length - 1])), function(x) { return op; }),
-                props);
-        return domain;
+        return [].concat(choice == "none" ? ['!'] : [],
+            _.map(_.range(_.max([0,props.length - 1])), function() { return op; }),
+            props);
     }
 });
 
-openerp.base.search.extended_filters_types = {
-    char: {
-        operators: [
-                    {value: "ilike", text: "contains"},
-                    {value: "not like", text: "doesn't contain"},
-                    {value: "=", text: "is equal to"},
-                    {value: "!=", text: "is not equal to"},
-                    {value: ">", text: "greater than"},
-                    {value: "<", text: "less than"},
-                    {value: ">=", text: "greater or equal than"},
-                    {value: "<=", text: "less or equal than"},
-        ],
-        build_component: function(parent) {
-            return new openerp.base.search.ExtendedSearchProposition.Char(parent);
-        }
-    }
-};
+openerp.base.search.custom_filters = new openerp.base.Registry({
+    'char': 'openerp.base.search.ExtendedSearchProposition.Char',
+    'datetime': 'openerp.base.search.ExtendedSearchProposition.DateTime'
+});
 
 openerp.base.search.ExtendedSearchProposition = openerp.base.BaseWidget.extend({
     template: 'SearchView.extended_search.proposition',
@@ -467,64 +446,72 @@ openerp.base.search.ExtendedSearchProposition = openerp.base.BaseWidget.extend({
     init: function (parent, fields) {
         this._super(parent);
         this.fields = _(fields).chain()
-            .map(function(val,key) {return {name:key, obj:val};})
-            .sortBy(function(x) {return x.obj.string;}).value();
+            .map(function(val, key) { return _.extend({}, val, {'name': key}); })
+            .sortBy(function(field) {return field.string;})
+            .value();
         this.attrs = {_: _, fields: this.fields, selected: null};
-        this.value_component = null;
+        this.value = null;
     },
     start: function () {
         this._super();
-        this.set_selected(this.fields.length > 0 ? this.fields[0] : null);
+        this.select_field(this.fields.length > 0 ? this.fields[0] : null);
         var _this = this;
-        this.$element.find(".searchview_extended_prop_field").change(function(e) {
+        this.$element.find(".searchview_extended_prop_field").change(function() {
             _this.changed();
-            e.stopPropagation();
-            e.preventDefault();
         });
         var delete_btn = this.$element.find('.searchview_extended_delete_prop');
-        delete_btn.click(function (e) {
+        delete_btn.click(function () {
             _this.stop();
-            e.stopPropagation();
-            e.preventDefault();
         });
     },
     changed: function() {
         var nval = this.$element.find(".searchview_extended_prop_field").val();
         if(this.attrs.selected == null || nval != this.attrs.selected.name) {
-            this.set_selected(_.detect(this.fields, function(x) {return x.name == nval;}));
+            this.select_field(_.detect(this.fields, function(x) {return x.name == nval;}));
         }
     },
-    set_selected: function(selected) {
+    /**
+     * Selects the provided field object
+     *
+     * @param field a field descriptor object (as returned by fields_get, augmented by the field name)
+     */
+    select_field: function(field) {
         var _this = this;
         if(this.attrs.selected != null) {
-            this.value_component.stop();
-            this.value_component = null;
+            this.value.stop();
+            this.value = null;
             this.$element.find('.searchview_extended_prop_op').html('');
         }
-        this.attrs.selected = selected;
-        if(selected == null) {
+        this.attrs.selected = field;
+        if(field == null) {
             return;
         }
-        var type = selected.obj.type;
-        var extended_filters_types = openerp.base.search.extended_filters_types;
-        type = type in extended_filters_types ? type : "char";
-        _.each(extended_filters_types[type].operators, function(operator) {
-            var option = jQuery('<option/>')
-                .attr('value', operator.value)
-                .text(operator.text)
-                .appendTo(_this.$element.find('.searchview_extended_prop_op'));
-        });
-        this.value_component = extended_filters_types[type].build_component(this);
-        var render = this.value_component.render({});
-        this.$element.find('.searchview_extended_prop_value').html(render);
-        this.value_component.start();
+
+        try {
+            this.value = new (openerp.base.search.custom_filters.get_object(field.type))
+                              (this);
+            _.each(this.value.operators, function(operator) {
+                var option = jQuery('<option>', {value: operator.value})
+                    .text(operator.text)
+                    .appendTo(_this.$element.find('.searchview_extended_prop_op'));
+            });
+            this.$element.find('.searchview_extended_prop_value').html(
+                this.value.render({}));
+            this.value.start();
+        } catch (e) {
+            if (! e instanceof openerp.base.KeyNotFound) {
+                throw e;
+            }
+            this.attrs.selected = null;
+            this.log('Unknow field type ' + e.key);
+        }
     },
     get_proposition: function() {
         if ( this.attrs.selected == null)
             return null;
         var field = this.attrs.selected.name;
         var op =  this.$element.find('.searchview_extended_prop_op').val();
-        var value = this.value_component.get_value();
+        var value = this.value.get_value();
         return [field, op, value];
     }
 });
@@ -532,7 +519,31 @@ openerp.base.search.ExtendedSearchProposition = openerp.base.BaseWidget.extend({
 openerp.base.search.ExtendedSearchProposition.Char = openerp.base.BaseWidget.extend({
     template: 'SearchView.extended_search.proposition.char',
     identifier_prefix: 'extended-search-proposition-char',
-    
+    operators: [
+        {value: "ilike", text: "contains"},
+        {value: "not ilike", text: "doesn't contain"},
+        {value: "=", text: "is equal to"},
+        {value: "!=", text: "is not equal to"},
+        {value: ">", text: "greater than"},
+        {value: "<", text: "less than"},
+        {value: ">=", text: "greater or equal than"},
+        {value: "<=", text: "less or equal than"}
+    ],
+    get_value: function() {
+        return this.$element.val();
+    }
+});
+openerp.base.search.ExtendedSearchProposition.DateTime = openerp.base.BaseWidget.extend({
+    template: 'SearchView.extended_search.proposition.char',
+    identifier_prefix: 'extended-search-proposition-datetime',
+    operators: [
+        {value: "=", text: "is equal to"},
+        {value: "!=", text: "is not equal to"},
+        {value: ">", text: "greater than"},
+        {value: "<", text: "less than"},
+        {value: ">=", text: "greater or equal than"},
+        {value: "<=", text: "less or equal than"}
+    ],
     get_value: function() {
         return this.$element.val();
     }
diff --git a/addons/base/static/src/xml/base.xml b/addons/base/static/src/xml/base.xml
index 3124f5a5686..006f8106105 100644
--- a/addons/base/static/src/xml/base.xml
+++ b/addons/base/static/src/xml/base.xml
@@ -368,8 +368,9 @@
         <t t-set="expand" t-value="false"/>
         <t t-set="label" t-value="'Extended Filters'"/>
         <t t-set="content">
-            <div class="searchview_extended_groups_list"></div>
-            <button class="searchview_extended_add_group">Add group of conditions</button>
+            <div class="searchview_extended_groups_list"/>
+            <button class="searchview_extended_add_group"
+                    type="button">Add group of conditions</button>
         </t>
     </t>
 </t>
@@ -382,8 +383,10 @@
         </select>
         <div class="searchview_extended_propositions_list">
         </div>
-        <button class="searchview_extended_add_proposition">Add condition</button>
-        <button class="searchview_extended_delete_group">Delete this group</button>
+        <button class="searchview_extended_add_proposition"
+                type="button">Add condition</button>
+        <button class="searchview_extended_delete_group"
+                type="button">Delete this group</button>
     </div>
 </t>
 <t t-name="SearchView.extended_search.proposition">
@@ -392,18 +395,17 @@
             <t t-foreach="attrs.fields" t-as="field">
                 <option t-att="{'selected': field === attrs.selected ? 'selected' : null}"
                         t-att-value="field.name">
-                    <t t-esc="field.obj.string"/>
+                    <t t-esc="field.string"/>
                 </option>
             </t>
         </select>
-        <select class="searchview_extended_prop_op">
-        </select>
-        <span class="searchview_extended_prop_value">
-        </span>
-        <button class="searchview_extended_delete_prop">Delete this condition</button>
+        <select class="searchview_extended_prop_op"/>
+        <span class="searchview_extended_prop_value"/>
+        <button class="searchview_extended_delete_prop"
+                type="button">Delete this condition</button>
     </div>
 </t>
 <t t-name="SearchView.extended_search.proposition.char">
-    <input t-att-id="element_id"></input>
+    <input t-att-id="element_id"/>
 </t>
 </templates>