[FIXUP] testable solution

addons/web/static/src/js/chrome/search_inputs.js

@@ -346,24 +346,18 @@ var DateField = Field.extend(/** @lends instance.web.search.DateField# */{
     complete: function (needle) {
         // Make sure the needle has a correct format before the creation of the moment object. See
         // issue https://github.com/moment/moment/issues/1407
+        var parseFormatOptions = {timezone: true};
         var t, v;
         try {
             t = (this.attrs && this.attrs.type === 'datetime') ? 'datetime' : 'date';
-            v = field_utils.parse[t](needle, {type: t}, {timezone: true});
+            v = field_utils.parse[t](needle, {type: t}, parseFormatOptions);
         } catch (e) {
             return $.when(null);
         }
 
-        if (t === 'date') {
-            // v is flagged UTC, so it will get transformed
-            // into the browser's timezone when calling toDate
-            // to avoid it, we use the string representation
-            // that will be truncated later to build another moment
-            v = v.format();
-        }
         var m = moment(v, t === 'datetime' ? 'YYYY-MM-DD HH:mm:ss' : 'YYYY-MM-DD');
         if (!m.isValid()) { return $.when(null); }
-        var date_string = field_utils.format[t](m, {type: t});
+        var date_string = field_utils.format[t](m, {type: t}, parseFormatOptions);
         var label = _.str.sprintf(_.str.escapeHTML(
             _t("Search %(field)s at: %(value)s")), {
                 field: '<em>' + _.escape(this.attrs.string) + '</em>',

addons/web/static/src/js/fields/field_utils.js

@@ -109,10 +109,11 @@ function formatDate(value, field, options) {
     if (value === false) {
         return "";
     }
-    if (field && field.type === 'datetime') {
-        if (!options || !('timezone' in options) || options.timezone) {
+    var fieldType = field && field.type;
+    if (fieldType === 'datetime' &&
+            (!options || !('timezone' in options)) ||
+        options && options.timezone) {
             value = value.clone().add(session.getTZOffset(value), 'minutes');
-        }
     }
     var date_format = time.getLangDateFormat();
     return value.format(date_format);
@@ -372,6 +373,9 @@ function parseDate(value, field, options) {
         date = moment.utc(value);
     } else {
         date = moment.utc(value, [datePattern, datePatternWoZero, moment.ISO_8601], true);
+        if (options && options.timezone) {
+            date.add(-session.getTZOffset(date), 'minutes');
+        }
     }
     if (date.isValid()) {
         if (date.year() === 0) {