diff --git a/core/oql/expression.class.inc.php b/core/oql/expression.class.inc.php
index 65ba8ea7b..e017bd1b0 100644
--- a/core/oql/expression.class.inc.php
+++ b/core/oql/expression.class.inc.php
@@ -448,6 +448,7 @@ class BinaryExpression extends Expression
 
 	public function GetCriterion($oSearch, &$aArgs = null, $bRetrofitParams = false, $oAttDef = null)
 	{
+		$bReverseOperator = false;
 		$oLeftExpr = $this->GetLeftExpr();
 		$oRightExpr = $this->GetRightExpr();
 		if ($oLeftExpr instanceof FieldExpression && $oRightExpr instanceof FieldExpression)
@@ -462,6 +463,7 @@ class BinaryExpression extends Expression
 		if ($oRightExpr instanceof FieldExpression)
 		{
 			$oAttDef = $oRightExpr->GetAttDef($oSearch->GetJoinedClasses());
+			$bReverseOperator = true;
 		}
 
 		if (is_null($oAttDef))
@@ -474,7 +476,33 @@ class BinaryExpression extends Expression
 
 		$aCriteria = array_merge($aCriteriaLeft, $aCriteriaRight);
 
-		$aCriteria['operator'] = $this->GetOperator();
+		if ($bReverseOperator)
+		{
+			// switch left and right expressions so reverse the operator
+			// Note that the operation is the same so < becomes > and not >=
+			switch ($this->GetOperator())
+			{
+				case '>':
+					$aCriteria['operator'] = '<';
+					break;
+				case '<':
+					$aCriteria['operator'] = '>';
+					break;
+				case '>=':
+					$aCriteria['operator'] = '<=';
+					break;
+				case '<=':
+					$aCriteria['operator'] = '>=';
+					break;
+				default:
+					$aCriteria['operator'] = $this->GetOperator();
+					break;
+			}
+		}
+		else
+		{
+			$aCriteria['operator'] = $this->GetOperator();
+		}
 		$aCriteria['oql'] = $this->Render($aArgs, $bRetrofitParams);
 
 		return $aCriteria;
diff --git a/pages/ajax.searchform.php b/pages/ajax.searchform.php
new file mode 100644
index 000000000..04c08643f
--- /dev/null
+++ b/pages/ajax.searchform.php
@@ -0,0 +1,81 @@
+<?php
+/**
+ * Copyright (C) 2010-2018 Combodo SARL
+ *
+ * This file is part of iTop.
+ *
+ *  iTop is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * iTop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with iTop. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+use Combodo\iTop\Application\Search\AjaxSearchException;
+use Combodo\iTop\Application\Search\CriterionParser;
+
+require_once('../approot.inc.php');
+require_once(APPROOT.'/application/application.inc.php');
+require_once(APPROOT.'/application/webpage.class.inc.php');
+require_once(APPROOT.'/application/ajaxwebpage.class.inc.php');
+require_once(APPROOT.'/application/startup.inc.php');
+require_once(APPROOT.'/application/user.preferences.class.inc.php');
+require_once(APPROOT.'/application/loginwebpage.class.inc.php');
+require_once(APPROOT.'/sources/application/search/ajaxsearchexception.class.inc.php');
+require_once(APPROOT.'/sources/application/search/criterionparser.class.inc.php');
+
+try
+{
+	if (LoginWebPage::EXIT_CODE_OK != LoginWebPage::DoLoginEx(null /* any portal */, false, LoginWebPage::EXIT_RETURN))
+	{
+		throw new SecurityException('You must be logged in');
+	}
+
+	$sParams = stripslashes(utils::ReadParam('params', '', false, 'raw_data'));
+	if (!$sParams)
+	{
+		throw new AjaxSearchException("Invalid query (empty filter)", 400);
+	}
+
+	$oPage = new ajax_page("");
+	$oPage->no_cache();
+	$oPage->SetContentType('text/html');
+
+	$aParams = json_decode($sParams, true);
+	$sOQL = CriterionParser::Parse($aParams['base_oql'], $aParams['criterion']);
+	$oFilter = DBSearch::FromOQL($sOQL);
+	$oDisplayBlock = new DisplayBlock($oFilter, 'list', false);
+
+	$aExtraParams['display_limit'] = true;
+	$aExtraParams['truncated'] = true;
+	$oDisplayBlock->RenderContent($oPage, $aExtraParams);
+
+	$oPage->output();
+
+} catch (AjaxSearchException $e)
+{
+	http_response_code($e->getCode());
+	// note: transform to cope with XSS attacks
+	echo htmlentities($e->GetMessage(), ENT_QUOTES, 'utf-8');
+	IssueLog::Error($e->getMessage()."\nDebug trace:\n".$e->getTraceAsString());
+} catch (SecurityException $e)
+{
+	http_response_code(403);
+	// note: transform to cope with XSS attacks
+	echo htmlentities($e->GetMessage(), ENT_QUOTES, 'utf-8');
+	IssueLog::Error($e->getMessage()."\nDebug trace:\n".$e->getTraceAsString());
+} catch (Exception $e)
+{
+	http_response_code(500);
+	// note: transform to cope with XSS attacks
+	echo htmlentities($e->GetMessage(), ENT_QUOTES, 'utf-8');
+	IssueLog::Error($e->getMessage()."\nDebug trace:\n".$e->getTraceAsString());
+}
\ No newline at end of file
diff --git a/sources/application/search/ajaxsearchexception.class.inc.php b/sources/application/search/ajaxsearchexception.class.inc.php
new file mode 100644
index 000000000..a3d259674
--- /dev/null
+++ b/sources/application/search/ajaxsearchexception.class.inc.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Copyright (C) 2010-2018 Combodo SARL
+ *
+ * This file is part of iTop.
+ *
+ *  iTop is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * iTop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with iTop. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * Created by PhpStorm.
+ * User: Eric
+ * Date: 08/03/2018
+ * Time: 11:18
+ */
+
+namespace Combodo\iTop\Application\Search;
+
+
+class AjaxSearchException extends \Exception
+{
+
+}
\ No newline at end of file
diff --git a/sources/application/search/criterionconversion.class.inc.php b/sources/application/search/criterionconversion.class.inc.php
new file mode 100644
index 000000000..ce98967aa
--- /dev/null
+++ b/sources/application/search/criterionconversion.class.inc.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Copyright (C) 2010-2018 Combodo SARL
+ *
+ * This file is part of iTop.
+ *
+ *  iTop is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * iTop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with iTop. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * Created by PhpStorm.
+ * User: Eric
+ * Date: 08/03/2018
+ * Time: 14:47
+ */
+
+namespace Combodo\iTop\Application\Search;
+
+
+class CriterionConversion
+{
+
+}
\ No newline at end of file
diff --git a/sources/application/search/criterionparser.class.inc.php b/sources/application/search/criterionparser.class.inc.php
new file mode 100644
index 000000000..98532bd1b
--- /dev/null
+++ b/sources/application/search/criterionparser.class.inc.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * Copyright (C) 2010-2018 Combodo SARL
+ *
+ * This file is part of iTop.
+ *
+ *  iTop is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * iTop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with iTop. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * Created by PhpStorm.
+ * User: Eric
+ * Date: 08/03/2018
+ * Time: 11:25
+ */
+
+namespace Combodo\iTop\Application\Search;
+
+
+use DBObjectSearch;
+use IssueLog;
+use OQLException;
+
+class CriterionParser
+{
+
+	/**
+	 * @param $sBaseOql
+	 * @param $aCriterion
+	 *
+	 * @return string
+	 */
+	public static function Parse($sBaseOql, $aCriterion)
+	{
+		$aExpression = array();
+		$aOr = $aCriterion['or'];
+		foreach($aOr as $aAndList)
+		{
+
+			$sExpression = self::ParseAndList($aAndList['and']);
+			if (!empty($sExpression))
+			{
+				$aExpression[] = $sExpression;
+			}
+		}
+
+		if (empty($aExpression))
+		{
+			return $sBaseOql;
+		}
+
+		// Sanitize the base OQL
+		if (strpos($sBaseOql, ' WHERE '))
+		{
+			try
+			{
+				$oSearch = DBObjectSearch::FromOQL($sBaseOql);
+				$oSearch->ResetCondition();
+				$sBaseOql = $oSearch->ToOQL();
+			} catch (OQLException $e)
+			{
+				IssueLog::Error($e->getMessage());
+			}
+		}
+
+		return $sBaseOql.' WHERE '.implode(" OR ", $aExpression).'';
+	}
+
+	private static function ParseAndList($aAnd)
+	{
+		$aExpression = array();
+		foreach($aAnd as $aCriteria)
+		{
+			$aExpression[] = self::ParseCriteria($aCriteria);
+		}
+
+		if (empty($aExpression))
+		{
+			return '';
+		}
+
+		return '('.implode(" AND ", $aExpression).')';
+	}
+
+	private static function ParseCriteria($aCriteria)
+	{
+
+		if (!empty($aCriteria['oql']))
+		{
+			return $aCriteria['oql'];
+		}
+
+		// TODO Manage more complicated case
+		$aRef = explode('.', $aCriteria['ref']);
+		$sRef = '`'.$aRef[0].'`.`'.$aRef[1].'`';
+
+		$sOperator = $aCriteria['operator'];
+		$sValue = $aCriteria['values'][0]['value'];
+
+		return "({$sRef} {$sOperator} '{$sValue}')";
+	}
+}
\ No newline at end of file
diff --git a/sources/application/search/searchform.class.inc.php b/sources/application/search/searchform.class.inc.php
index ea7b72601..d3c45e4b0 100644
--- a/sources/application/search/searchform.class.inc.php
+++ b/sources/application/search/searchform.class.inc.php
@@ -112,6 +112,7 @@ class SearchForm
 
 		$aSearchParams = array(
 			'criterion_outer_selector' => "#fs_{$sSearchFormId}_criterion_outer",
+			'endpoint' => utils::GetAbsoluteUrlAppRoot().'pages/ajax.searchform.php',
 			'search' => array(
 				'fields' => $aFields,
 				'criterion' => $aCriterion,
diff --git a/test/application/search/CriterionParserTest.php b/test/application/search/CriterionParserTest.php
new file mode 100644
index 000000000..f36068650
--- /dev/null
+++ b/test/application/search/CriterionParserTest.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * Copyright (C) 2010-2018 Combodo SARL
+ *
+ * This file is part of iTop.
+ *
+ *  iTop is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * iTop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with iTop. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * Created by PhpStorm.
+ * User: Eric
+ * Date: 08/03/2018
+ * Time: 11:28
+ */
+
+namespace Combodo\iTop\Test\UnitTest\Application\Search;
+
+use Combodo\iTop\Application\Search\CriterionParser;
+use Combodo\iTop\Test\UnitTest\ItopDataTestCase;
+
+
+class CriterionParserTest extends ItopDataTestCase
+{
+	/**
+	 * @throws Exception
+	 */
+	protected function setUp()
+	{
+		parent::setUp();
+
+		require_once(APPROOT."sources/application/search/criterionparser.class.inc.php");
+	}
+
+	public function testParse()
+	{
+		$sBaseOql = 'SELECT UserRequest';
+		$aCriterion = json_decode('{
+    "or": [
+        {
+            "and": [
+                {
+                    "ref": "UserRequest.start_date",
+                    "values": [
+                        {
+                            "value": "2017-01-01",
+                            "label": "2017-01-01 00:00:00"
+                        }
+                    ],
+                    "operator": ">",
+                    "oql": ""
+                },
+                {
+                    "ref": "UserRequest.start_date",
+                    "values": [
+                        {
+                            "value": "2018-01-01",
+                            "label": "2018-01-01 00:00:00"
+                        }
+                    ],
+                    "operator": "<",
+                    "oql": "(`UserRequest`.`start_date` < \'2018-01-01\')"
+                }
+            ]
+        }
+    ]
+}
+', true);
+		$sOQL = CriterionParser::Parse($sBaseOql, $aCriterion);
+
+		$this->debug($sOQL);
+		$this->markTestIncomplete();
+	}
+}
diff --git a/test/application/search/SearchFormTest.php b/test/application/search/SearchFormTest.php
index 695b6d159..68c3fce7c 100644
--- a/test/application/search/SearchFormTest.php
+++ b/test/application/search/SearchFormTest.php
@@ -59,6 +59,8 @@ class SearchFormTest extends ItopDataTestCase
 	public function testGetCriterion($sOQL, $iOrCount)
 	{
 		$aCriterion = SearchForm::GetCriterion(\DBObjectSearch::FromOQL($sOQL));
+		$aRes = array('base_oql' => $sOQL, 'criterion' => $aCriterion);
+		$this->debug(json_encode($aRes));
 		$this->debug($sOQL);
 		$this->debug(json_encode($aCriterion, JSON_PRETTY_PRINT));
 		$this->assertCount($iOrCount, $aCriterion['or']);
@@ -75,7 +77,7 @@ class SearchFormTest extends ItopDataTestCase
 			array('OQL' => "SELECT Contact WHERE status IN ('active', 'inactive')", 1),
 			array('OQL' => "SELECT Contact WHERE status = 'active' OR name LIKE 'toto%'", 2),
 			array('OQL' => "SELECT UserRequest WHERE DATE_SUB(NOW(), INTERVAL 14 DAY) < start_date", 1),
-			array('OQL' => "SELECT UserRequest WHERE start_date > '2017-01-01' AND start_date < '2018-01-01'", 1),
+			array('OQL' => "SELECT UserRequest WHERE start_date > '2017-01-01' AND '2018-01-01' >= start_date", 1),
 		);
 	}
 }