4 files changed, 8 insertions, 8 deletions
diff --git a/src/openvic-simulation/map/Map.cpp b/src/openvic-simulation/map/Map.cpp
index 4df17bf..4790853 100644
--- a/src/openvic-simulation/map/Map.cpp
+++ b/src/openvic-simulation/map/Map.cpp
@@ -292,7 +292,7 @@ bool Map::setup(BuildingManager const& building_manager, PopManager const& pop_m
 	return ret;
 }
 
-void Map::update_state(Date const& today) {
+void Map::update_state(Date today) {
 	for (Province& province : provinces.get_items()) {
 		province.update_state(today);
 	}
@@ -300,7 +300,7 @@ void Map::update_state(Date const& today) {
 	update_total_map_population();
 }
 
-void Map::tick(Date const& today) {
+void Map::tick(Date today) {
 	for (Province& province : provinces.get_items()) {
 		province.tick(today);
 	}
diff --git a/src/openvic-simulation/map/Map.hpp b/src/openvic-simulation/map/Map.hpp
index 61b7b48..d11ad8e 100644
--- a/src/openvic-simulation/map/Map.hpp
+++ b/src/openvic-simulation/map/Map.hpp
@@ -108,8 +108,8 @@ namespace OpenVic {
 		void update_total_map_population();
 		Pop::pop_size_t get_total_map_population() const;
 
-		void update_state(Date const& today);
-		void tick(Date const& today);
+		void update_state(Date today);
+		void tick(Date today);
 
 		bool load_province_definitions(std::vector<ovdl::csv::LineObject> const& lines);
 		bool load_province_positions(BuildingManager const& building_manager, ast::NodeCPtr root);
diff --git a/src/openvic-simulation/map/Province.cpp b/src/openvic-simulation/map/Province.cpp
index 225d4c0..7b88ebf 100644
--- a/src/openvic-simulation/map/Province.cpp
+++ b/src/openvic-simulation/map/Province.cpp
@@ -155,14 +155,14 @@ void Province::update_pops() {
 	}
 }
 
-void Province::update_state(Date const& today) {
+void Province::update_state(Date today) {
 	for (BuildingInstance& building : buildings.get_items()) {
 		building.update_state(today);
 	}
 	update_pops();
 }
 
-void Province::tick(Date const& today) {
+void Province::tick(Date today) {
 	for (BuildingInstance& building : buildings.get_items()) {
 		building.tick(today);
 	}
diff --git a/src/openvic-simulation/map/Province.hpp b/src/openvic-simulation/map/Province.hpp
index 2704354..10f3a9a 100644
--- a/src/openvic-simulation/map/Province.hpp
+++ b/src/openvic-simulation/map/Province.hpp
@@ -110,8 +110,8 @@ namespace OpenVic {
 		distribution_t const& get_religion_distribution() const;
 		void update_pops();
 
-		void update_state(Date const& today);
-		void tick(Date const& today);
+		void update_state(Date today);
+		void tick(Date today);
 
 		bool is_adjacent_to(Province const* province);
 		bool add_adjacency(Province const* province, distance_t distance, flags_t flags);