diff --git a/htdocs/core/db/DoliDB.class.php b/htdocs/core/db/DoliDB.class.php
index c7e08e69a6e..0caba62bf2d 100644
--- a/htdocs/core/db/DoliDB.class.php
+++ b/htdocs/core/db/DoliDB.class.php
@@ -77,6 +77,18 @@ abstract class DoliDB implements Database
 		return 'IF('.$test.','.$resok.','.$resko.')';
 	}
 
+	/**
+	 *   Convert (by PHP) a GM Timestamp date into a string date with PHP server TZ to insert into a date field.
+	 *   Function to use to build INSERT, UPDATE or WHERE predica
+	 *
+	 *   @param	    string	$param      Date TMS to convert
+	 *   @return	string      		Date in a string YYYYMMDDHHMMSS
+	 */
+	function idate($param)
+	{
+		return dol_print_date($param,"%Y%m%d%H%M%S");
+	}
+
 	/**
 	 * Define sort criteria of request
 	 *
diff --git a/htdocs/core/db/mysql.class.php b/htdocs/core/db/mysql.class.php
index 4ce71647c4a..d1d86711513 100644
--- a/htdocs/core/db/mysql.class.php
+++ b/htdocs/core/db/mysql.class.php
@@ -518,19 +518,6 @@ class DoliDBMysql extends DoliDB
 		return addslashes($stringtoencode);
 	}
 
-
-	/**
-	 *  Convert (by PHP) a GM Timestamp date into a string date with PHP server TZ to insert into a date field.
-	 *  Function to use to build INSERT, UPDATE or WHERE predica
-	 *
-	 *  @param	    string	$param      Date TMS to convert
-	 *  @return	string      		Date in a string YYYYMMDDHHMMSS
-	 */
-	function idate($param)
-	{
-		return dol_print_date($param,"%Y%m%d%H%M%S");
-	}
-
 	/**
 	 *	Return last request executed with query()
 	 *
diff --git a/htdocs/core/db/mysqli.class.php b/htdocs/core/db/mysqli.class.php
index 4daefe3a397..f4d8d6f6a44 100644
--- a/htdocs/core/db/mysqli.class.php
+++ b/htdocs/core/db/mysqli.class.php
@@ -529,19 +529,6 @@ class DoliDBMysqli extends DoliDB
         return addslashes($stringtoencode);
     }
 
-    /**
-	 *   Convert (by PHP) a GM Timestamp date into a string date with PHP server TZ to insert into a date field.
-     *   Function to use to build INSERT, UPDATE or WHERE predica
-     *
-     *   @param	    string	$param      Date TMS to convert
-     *   @return	string      		Date in a string YYYYMMDDHHMMSS
-     */
-    function idate($param)
-    {
-        return dol_print_date($param,"%Y%m%d%H%M%S");
-    }
-
-
     /**
 	 *	Return last request executed with query()
 	 *
diff --git a/htdocs/core/db/sqlite.class.php b/htdocs/core/db/sqlite.class.php
index f3c52762b0a..4695bb15807 100644
--- a/htdocs/core/db/sqlite.class.php
+++ b/htdocs/core/db/sqlite.class.php
@@ -662,18 +662,6 @@ class DoliDBSqlite extends DoliDB
         return $this->db->quote($stringtoencode);
     }
 
-    /**
-     *   Convert (by PHP) a GM Timestamp date into a PHP server TZ to insert into a date field.
-     *   Function to use to build INSERT, UPDATE or WHERE predica
-     *
-     *   @param	    string	$param      Date TMS to convert
-     *   @return	string      		Date in a string YYYYMMDDHHMMSS
-     */
-    function idate($param)
-    {
-        return dol_print_date($param,"%Y%m%d%H%M%S");
-    }
-
     /**
      *	Renvoie la derniere requete soumise par la methode query()
      *