diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index b779c901b54..240dd7c4c41 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -303,7 +303,7 @@ ErrorValueForTooLow=Value for <b>%s</b> is too low
 ErrorValueCantBeNull=Value for <b>%s</b> can't be null
 ErrorDateOfMovementLowerThanDateOfFileTransmission=The date of the bank transaction can't be lower than the date of the file transmission
 ErrorTooMuchFileInForm=Too much files in form, the maximum number is %s file(s)
-ErrorSessionInvalidatedAfterPasswordChange=The session was invalidated after a password change. Please relogin.
+ErrorSessionInvalidatedAfterPasswordChange=The session was invalidated after a password or dates of validity change. Please relogin.
 
 # Warnings
 WarningParamUploadMaxFileSizeHigherThanPostMaxSize=Your PHP parameter upload_max_filesize (%s) is higher than PHP parameter post_max_size (%s). This is not a consistent setup.
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 24ce10ea7c1..df62eea68c4 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -881,7 +881,7 @@ if (!defined('NOLOGIN')) {
 
 		$resultFetchUser = $user->fetch('', $login, '', 1, ($entitytotest > 0 ? $entitytotest : -1)); // value for $login was retrieved previously when checking password.
 		if ($resultFetchUser <= 0 || $user->isNotIntoValidityDateRange()) {
-			dol_syslog('User not found, connexion refused');
+			dol_syslog('User not found or not valid, connexion refused');
 			session_destroy();
 			session_set_cookie_params(0, '/', null, (empty($dolibarr_main_force_https) ? false : true), true); // Add tag secure and httponly on session cookie
 			session_name($sessionname);
@@ -949,9 +949,12 @@ if (!defined('NOLOGIN')) {
 		dol_syslog("- This is an already logged session. _SESSION['dol_login']=".$login." _SESSION['dol_entity']=".$entity, LOG_DEBUG);
 
 		$resultFetchUser = $user->fetch('', $login, '', 1, ($entity > 0 ? $entity : -1));
+
+		//var_dump(dol_print_date($user->flagdelsessionsbefore, 'dayhour', 'gmt')." ".dol_print_date($_SESSION["dol_logindate"], 'dayhour', 'gmt'));
+
 		if ($resultFetchUser <= 0
 			|| ($user->flagdelsessionsbefore && !empty($_SESSION["dol_logindate"]) && $user->flagdelsessionsbefore > $_SESSION["dol_logindate"])
-			|| ($user->isNotIntoValidtyDateRange())) {
+			|| ($user->isNotIntoValidityDateRange())) {
 			if ($resultFetchUser <= 0) {
 				// Account has been removed after login
 				dol_syslog("Can't load user even if session logged. _SESSION['dol_login']=".$login, LOG_WARNING);
diff --git a/htdocs/user/class/user.class.php b/htdocs/user/class/user.class.php
index f8d437d4fa0..2893378bdd9 100644
--- a/htdocs/user/class/user.class.php
+++ b/htdocs/user/class/user.class.php
@@ -2702,24 +2702,26 @@ class User extends CommonObject
 	 *  Return a link with photo
 	 * 	Use this->id,this->photo
 	 *
-	 *	@return	int		0=No more valid, >0 if OK
+	 *	@return	int		0=Valid, >0 if not valid
 	 */
-	public function isNotIntoValidtyDateRange()
+	public function isNotIntoValidityDateRange()
 	{
 		include_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 
 		$now = dol_now();
 
+		//dol_syslog("isNotIntoValidityDateRange ".$this->datestartvalidity);
+
 		// Check date start validity
 		if ($this->datestartvalidity && $this->datestartvalidity > dol_get_last_hour($now)) {
-			return 0;
+			return 1;
 		}
 		// Check date end validity
 		if ($this->dateendvalidity && $this->dateendvalidity < dol_get_first_hour($now)) {
-			return 0;
+			return 1;
 		}
 
-		return 1;
+		return 0;
 	}