diff --git a/ChangeLog b/ChangeLog
index 1c9578507eb..46f482aeab9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -114,6 +114,7 @@ For developers:
 - New: Add PRODUCT_PRICE_MODIFY trigger.
 - New: Created function to retrieve total amount of discount of an invoice/proposal...
 - New: We can use a dynamic value ($conf->global->XXX for example) into titles of menus.
+- New: Use PHP classes DateTime* for some data functions instead of adodb 
 - Qual: Renamed SUPPLIER_INVOICE_BUILDDOC trigger to BILL_SUPPLIER_BUILDDOC
 - Qual: Renamed INVOICE_SUPPLIER_DELETE trigger to BILL_SUPPLIER_DELETE
 - Qual: Renamed SUPLIER_ORDER_BUILDDOC trigger to ORDER_SUPPLIER_BUILDDOC
diff --git a/htdocs/core/lib/date.lib.php b/htdocs/core/lib/date.lib.php
index 921cfa392a1..c7a7e1240dd 100644
--- a/htdocs/core/lib/date.lib.php
+++ b/htdocs/core/lib/date.lib.php
@@ -88,7 +88,7 @@ function getServerTimeZoneInt($refgmtdate='now')
         // Method 1 (include daylight)
         $gmtnow=dol_now('gmt'); $yearref=dol_print_date($gmtnow,'%Y'); $monthref=dol_print_date($gmtnow,'%m'); $dayref=dol_print_date($gmtnow,'%d');
         if ($refgmtdate == 'now') $newrefgmtdate=$yearref.'-'.$monthref.'-'.$dayref;
-        elseif ($refgmtdate == 'summer') $newrefgmtdate=$yearref.'-05-15';
+        elseif ($refgmtdate == 'summer') $newrefgmtdate=$yearref.'-08-01';
         else $newrefgmtdate=$yearref.'-01-01';
         $localtz = new DateTimeZone(getServerTimeZoneString());
         $localdt = new DateTime($newrefgmtdate, $localtz);
@@ -773,7 +773,7 @@ function num_open_day($timestampStart, $timestampEnd, $inhour=0, $lastday=0, $ha
 	global $langs;
 
 	dol_syslog('num_open_day timestampStart='.$timestampStart.' timestampEnd='.$timestampEnd.' bit='.$lastday);
-	
+
 	// Check parameters
 	if (! is_int($timestampStart) && ! is_float($timestampStart)) return 'ErrorBadParameter_num_open_day';
 	if (! is_int($timestampEnd) && ! is_float($timestampEnd)) return 'ErrorBadParameter_num_open_day';
diff --git a/htdocs/core/modules/syslog/mod_syslog_file.php b/htdocs/core/modules/syslog/mod_syslog_file.php
index 4fd8452f970..b00fa11945a 100644
--- a/htdocs/core/modules/syslog/mod_syslog_file.php
+++ b/htdocs/core/modules/syslog/mod_syslog_file.php
@@ -116,27 +116,32 @@ class mod_syslog_file extends LogHandler implements LogHandlerInterface
 		if (defined("SYSLOG_FILE_NO_ERROR")) $filefd = @fopen($logfile, 'a+');
 		else $filefd = fopen($logfile, 'a+');
 
-		if (!$filefd && ! defined("SYSLOG_FILE_NO_ERROR"))
+		if (! $filefd)
 		{
-			// Do not break dolibarr usage if log fails
-			//throw new Exception('Failed to open log file '.basename($logfile));
-			print 'Failed to open log file '.basename($logfile);
+			if (! defined("SYSLOG_FILE_NO_ERROR"))
+			{
+				// Do not break dolibarr usage if log fails
+				//throw new Exception('Failed to open log file '.basename($logfile));
+				print 'Failed to open log file '.basename($logfile);
+			}
 		}
+		else
+		{
+			$logLevels = array(
+				LOG_EMERG => 'EMERG',
+				LOG_ALERT => 'ALERT',
+				LOG_CRIT => 'CRIT',
+				LOG_ERR => 'ERR',
+				LOG_WARNING => 'WARNING',
+				LOG_NOTICE => 'NOTICE',
+				LOG_INFO => 'INFO',
+				LOG_DEBUG => 'DEBUG'
+			);
 
-		$logLevels = array(
-			LOG_EMERG => 'EMERG',
-			LOG_ALERT => 'ALERT',
-			LOG_CRIT => 'CRIT',
-			LOG_ERR => 'ERR',
-			LOG_WARNING => 'WARNING',
-			LOG_NOTICE => 'NOTICE',
-			LOG_INFO => 'INFO',
-			LOG_DEBUG => 'DEBUG'
-		);
+			$message = dol_print_date(time(),"%Y-%m-%d %H:%M:%S")." ".sprintf("%-5s", $logLevels[$content['level']])." ".sprintf("%-15s", $content['ip'])." ".($this->ident>0?str_pad('',$this->ident,' '):'').$content['message'];
 
-		$message = dol_print_date(time(),"%Y-%m-%d %H:%M:%S")." ".sprintf("%-5s", $logLevels[$content['level']])." ".sprintf("%-15s", $content['ip'])." ".($this->ident>0?str_pad('',$this->ident,' '):'').$content['message'];
-
-		fwrite($filefd, $message."\n");
-		fclose($filefd);
+			fwrite($filefd, $message."\n");
+			fclose($filefd);
+		}
 	}
 }
\ No newline at end of file