diff --git a/htdocs/core/lib/date.lib.php b/htdocs/core/lib/date.lib.php
index abe83bbd1a3..f2b69036218 100644
--- a/htdocs/core/lib/date.lib.php
+++ b/htdocs/core/lib/date.lib.php
@@ -762,7 +762,7 @@ function getGMTEasterDatetime($year)
  */
 function num_public_holiday($timestampStart, $timestampEnd, $country_code = '', $lastday = 0, $includesaturday = -1, $includesunday = -1, $includefriday = -1, $includemonday = -1)
 {
-	global $db, $mysoc;
+	global $conf, $db, $mysoc;
 
 	$nbFerie = 0;
 
@@ -789,21 +789,10 @@ function num_public_holiday($timestampStart, $timestampEnd, $country_code = '',
 
 	$country_id = dol_getIdFromCode($db, $country_code, 'c_country', 'code', 'rowid');
 
-	$i = 0;
-	while ((($lastday == 0 && $timestampStart < $timestampEnd) || ($lastday && $timestampStart <= $timestampEnd))
-		&& ($i < 50000)) {		// Loop end when equals (Test on i is a security loop to avoid infinite loop)
-		$ferie = false;
-		$specialdayrule = array();
-
-		$jour  = (int) gmdate("d", $timestampStart);
-		$mois  = (int) gmdate("m", $timestampStart);
-		$annee = (int) gmdate("Y", $timestampStart);
-
-		//print "jour=".$jour." month=".$mois." year=".$annee." includesaturday=".$includesaturday." includesunday=".$includesunday."\n";
-
+	if (empty($conf->cache['arrayOfActivePublicHolidays_'.$country_id])) {
 		// Loop on public holiday defined into hrm_public_holiday for the day, month and year analyzed
-		// TODO Execute this request first and store results into an array, then reuse this array.
-		$sql = "SELECT code, entity, fk_country, dayrule, year, month, day, active";
+		$tmpArrayOfPublicHolidays = array();
+		$sql = "SELECT id, code, entity, fk_country, dayrule, year, month, day, active";
 		$sql .= " FROM ".MAIN_DB_PREFIX."c_hrm_public_holiday";
 		$sql .= " WHERE active = 1 and fk_country IN (0".($country_id > 0 ? ", ".$country_id : 0).")";
 		$sql .= " AND entity IN (0," .getEntity('holiday') .")";
@@ -814,34 +803,55 @@ function num_public_holiday($timestampStart, $timestampEnd, $country_code = '',
 			$i = 0;
 			while ($i < $num_rows) {
 				$obj = $db->fetch_object($resql);
-
-				if (!empty($obj->dayrule) && $obj->dayrule != 'date') {		// For example 'easter', '...'
-					$specialdayrule[$obj->dayrule] = $obj->dayrule;
-				} else {
-					$match = 1;
-					if (!empty($obj->year) && $obj->year != $annee) {
-						$match = 0;
-					}
-					if ($obj->month != $mois) {
-						$match = 0;
-					}
-					if ($obj->day != $jour) {
-						$match = 0;
-					}
-
-					if ($match) {
-						$ferie = true;
-					}
-				}
-
+				$tmpArrayOfPublicHolidays[$obj->id] = array('dayrule' => $obj->dayrule, 'year' => $obj->year, 'month' => $obj->month, 'day' => $obj->day);
 				$i++;
 			}
 		} else {
 			dol_syslog($db->lasterror(), LOG_ERR);
 			return 'Error sql '.$db->lasterror();
 		}
-		//var_dump($specialdayrule)."\n";
-		//print "ferie=".$ferie."\n";
+
+		//var_dump($tmpArrayOfPublicHolidays);
+		$conf->cache['arrayOfActivePublicHolidays_'.$country_id] = $tmpArrayOfPublicHolidays;
+	}
+
+	$arrayOfPublicHolidays = $conf->cache['arrayOfActivePublicHolidays_'.$country_id];
+
+	$i = 0;
+	while ((($lastday == 0 && $timestampStart < $timestampEnd) || ($lastday && $timestampStart <= $timestampEnd))
+		&& ($i < 50000)) {		// Loop end when equals (Test on i is a security loop to avoid infinite loop)
+			$ferie = false;
+			$specialdayrule = array();
+
+			$jour  = (int) gmdate("d", $timestampStart);
+			$mois  = (int) gmdate("m", $timestampStart);
+			$annee = (int) gmdate("Y", $timestampStart);
+
+			//print "jour=".$jour." month=".$mois." year=".$annee." includesaturday=".$includesaturday." includesunday=".$includesunday."\n";
+		foreach ($arrayOfPublicHolidays as $entrypublicholiday) {
+			if (!empty($entrypublicholiday['dayrule']) && $entrypublicholiday['dayrule'] != 'date') {		// For example 'easter', '...'
+				$specialdayrule[$entrypublicholiday['dayrule']] = $entrypublicholiday['dayrule'];
+			} else {
+				$match = 1;
+				if (!empty($entrypublicholiday['year']) && $entrypublicholiday['year'] != $annee) {
+					$match = 0;
+				}
+				if ($entrypublicholiday['month'] != $mois) {
+					$match = 0;
+				}
+				if ($entrypublicholiday['day'] != $jour) {
+					$match = 0;
+				}
+
+				if ($match) {
+					$ferie = true;
+				}
+			}
+
+			$i++;
+		}
+			//var_dump($specialdayrule)."\n";
+			//print "ferie=".$ferie."\n";
 
 		if (!$ferie) {
 			// Special dayrules
@@ -955,9 +965,9 @@ function num_public_holiday($timestampStart, $timestampEnd, $country_code = '',
 				// Geneva fast in Switzerland
 			}
 		}
-		//print "ferie=".$ferie."\n";
+			//print "ferie=".$ferie."\n";
 
-		// If we have to include Friday, Saturday and Sunday
+			// If we have to include Friday, Saturday and Sunday
 		if (!$ferie) {
 			if ($includefriday || $includesaturday || $includesunday) {
 				$jour_julien = unixtojd($timestampStart);
@@ -979,18 +989,18 @@ function num_public_holiday($timestampStart, $timestampEnd, $country_code = '',
 				}
 			}
 		}
-		//print "ferie=".$ferie."\n";
+			//print "ferie=".$ferie."\n";
 
-		// We increase the counter of non working day
+			// We increase the counter of non working day
 		if ($ferie) {
 			$nbFerie++;
 		}
 
-		// Increase number of days (on go up into loop)
-		$timestampStart = dol_time_plus_duree($timestampStart, 1, 'd');
-		//var_dump($jour.' '.$mois.' '.$annee.' '.$timestampStart);
+			// Increase number of days (on go up into loop)
+			$timestampStart = dol_time_plus_duree($timestampStart, 1, 'd');
+			//var_dump($jour.' '.$mois.' '.$annee.' '.$timestampStart);
 
-		$i++;
+			$i++;
 	}
 
 	//print "nbFerie=".$nbFerie."\n";