diff --git a/library/include/mobilisis/utilities.h b/library/include/mobilisis/utilities.h
index 71f59d7..342b193 100644
--- a/library/include/mobilisis/utilities.h
+++ b/library/include/mobilisis/utilities.h
@@ -1,6 +1,5 @@
 #pragma once
 #include <cstring>
-#include <string.h>
 #include <ctime>
 #include <iostream>
 #include <cmath>
@@ -9,6 +8,7 @@
 #include "configuration.h"
 #include "time_range.h"
 #include "payment_method.h"
+#include "tariff_business_hours.h"
 
 #include <QDateTime>
 
@@ -87,4 +87,7 @@ namespace Utilities {
     int getMaximalParkingTime(Configuration const *cfg, PaymentMethod methodId);
     uint32_t getMinimalParkingPrice(Configuration const *cfg, PaymentMethod methodId);
     uint32_t getFirstDurationStep(Configuration const *cfg, PaymentMethod methodId);
+    BusinessHours getBusinessHours(Configuration const *cfg, PaymentMethod methodId);
+    uint32_t computeWeekDaysPrice(Configuration const *cfg, PaymentMethod id);
+    double computeWeekDaysDurationUnit(Configuration const *cfg, PaymentMethod id);
 }