diff --git a/library/include/mobilisis/calculate_price.h b/library/include/mobilisis/calculate_price.h
index 8df9da2..8dfd4c5 100644
--- a/library/include/mobilisis/calculate_price.h
+++ b/library/include/mobilisis/calculate_price.h
@@ -111,8 +111,7 @@ int CALCULATE_LIBRARY_API get_zone_nr(int zone = -1);
 
 int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int currentTimeMinutes, int UpDown);
 
-class Calculator;
-Calculator CALCULATE_LIBRARY_API *get_calculator();
+QList<int> CALCULATE_LIBRARY_API get_time_steps(Configuration *cfg, qint64 startInMinutes = QDateTime::currentSecsSinceEpoch() / 60);
 
 CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(       // deprecated
                                             parking_tariff_t *tariff,
diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index c9d9ab2..5d026c7 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -8,11 +8,12 @@
 #include <QFileInfo>
 #include <QDateTime>
 #include <QDebug>
+#include <QList>
 
 static Calculator calculator;
 
-Calculator CALCULATE_LIBRARY_API *get_calculator() {
-    return &calculator;
+QList<int> CALCULATE_LIBRARY_API get_time_steps(Configuration *cfg, qint64 startInMinutes) {
+    return calculator.GetTimeSteps(cfg, startInMinutes);
 }
 
 int CALCULATE_LIBRARY_API get_zone_nr(int zone)