diff --git a/htdocs/core/lib/date.lib.php b/htdocs/core/lib/date.lib.php
index fe21071901a..addf05883c7 100644
--- a/htdocs/core/lib/date.lib.php
+++ b/htdocs/core/lib/date.lib.php
@@ -182,7 +182,7 @@ function dol_time_plus_duree($time, $duration_value, $duration_unit)
  */
 function convertTime2Seconds($iHours = 0, $iMinutes = 0, $iSeconds = 0)
 {
-	$iResult = ($iHours * 3600) + ($iMinutes * 60) + $iSeconds;
+	$iResult = ((int)$iHours * 3600) + ((int)$iMinutes * 60) + (int)$iSeconds;
 	return $iResult;
 }
 
@@ -218,6 +218,7 @@ function convertSecondToTime($iSecond, $format = 'all', $lengthOfDay = 86400, $l
 	if (empty($lengthOfWeek)) {
 		$lengthOfWeek = 7; // 1 week = 7 days
 	}
+	$nbHbyDay = $lengthOfDay / 3600;
 
 	if ($format == 'all' || $format == 'allwithouthour' || $format == 'allhour' || $format == 'allhourmin' || $format == 'allhourminsec') {
 		if ((int) $iSecond === 0) {
@@ -265,11 +266,11 @@ function convertSecondToTime($iSecond, $format = 'all', $lengthOfDay = 86400, $l
 				$sTime .= dol_print_date($iSecond, 'hourduration', true);
 			}
 		} elseif ($format == 'allhourminsec') {
-			return sprintf("%02d", ($sWeek * $lengthOfWeek * 24 + $sDay * 24 + (int) floor($iSecond / 3600))).':'.sprintf("%02d", ((int) floor(($iSecond % 3600) / 60))).':'.sprintf("%02d", ((int) ($iSecond % 60)));
+		    return sprintf("%02d", ($sWeek * $lengthOfWeek * $nbHbyDay + $sDay * $nbHbyDay + (int) floor($iSecond/3600))).':'.sprintf("%02d", ((int) floor(($iSecond % 3600) / 60))).':'.sprintf("%02d", ((int) ($iSecond % 60)));
 		} elseif ($format == 'allhourmin') {
-			return sprintf("%02d", ($sWeek * $lengthOfWeek * 24 + $sDay * 24 + (int) floor($iSecond / 3600))).':'.sprintf("%02d", ((int) floor(($iSecond % 3600) / 60)));
+		    return sprintf("%02d", ($sWeek * $lengthOfWeek * $nbHbyDay + $sDay * $nbHbyDay + (int) floor($iSecond/3600))).':'.sprintf("%02d", ((int) floor(($iSecond % 3600)/60)));
 		} elseif ($format == 'allhour') {
-			return sprintf("%02d", ($sWeek * $lengthOfWeek * 24 + $sDay * 24 + (int) floor($iSecond / 3600)));
+			return sprintf("%02d", ($sWeek * $lengthOfWeek * $nbHbyDay + $sDay * $nbHbyDay + (int) floor($iSecond/3600)));
 		}
 	} elseif ($format == 'hour') {	// only hour part
 		$sTime = dol_print_date($iSecond, '%H', true);
@@ -855,6 +856,15 @@ function num_public_holiday($timestampStart, $timestampEnd, $country_code = '',
 				}
 				// Fronleichnam
 			}
+
+			if (in_array('genevafast', $specialdayrule)) {
+				// Geneva fast in Switzerland (Thursday after the first sunday in September)
+				$date_1sunsept = strtotime('next thursday', strtotime('next sunday', mktime(0, 0, 0, 9, 1, $annee)));
+				$jour_1sunsept = date("d", $date_1sunsept);
+				$mois_1sunsept = date("m", $date_1sunsept);
+				if($jour_1sunsept == $jour && $mois_1sunsept == $mois) $ferie=true;
+				// Geneva fast in Switzerland
+			}
 		}
 		//print "ferie=".$ferie."\n";