5 files changed, 25 insertions, 0 deletions
diff --git a/src/headless/main.cpp b/src/headless/main.cpp
index ecce333..fcb5e8d 100644
--- a/src/headless/main.cpp
+++ b/src/headless/main.cpp
@@ -49,6 +49,9 @@ static bool run_headless(Dataloader::path_vector_t const& roots, bool run_tests)
 	Logger::info("===== Starting game session... =====");
 	ret &= game_manager.start_game_session();
 
+	// This triggers a gamestate update
+	ret &= game_manager.update_clock();
+
 	return ret;
 }
 
diff --git a/src/openvic-simulation/GameManager.cpp b/src/openvic-simulation/GameManager.cpp
index 2577b54..2980dbd 100644
--- a/src/openvic-simulation/GameManager.cpp
+++ b/src/openvic-simulation/GameManager.cpp
@@ -74,3 +74,12 @@ bool GameManager::start_game_session() {
 
 	return instance_manager->start_game_session();
 }
+
+bool GameManager::update_clock() {
+	if (!instance_manager) {
+		Logger::error("Cannot update clock - instance manager uninitialised!");
+		return false;
+	}
+
+	return instance_manager->update_clock();
+}
diff --git a/src/openvic-simulation/GameManager.hpp b/src/openvic-simulation/GameManager.hpp
index fdbcb6a..91de279 100644
--- a/src/openvic-simulation/GameManager.hpp
+++ b/src/openvic-simulation/GameManager.hpp
@@ -38,5 +38,7 @@ namespace OpenVic {
 		bool setup_instance(Bookmark const* bookmark);
 
 		bool start_game_session();
+
+		bool update_clock();
 	};
 }
diff --git a/src/openvic-simulation/InstanceManager.cpp b/src/openvic-simulation/InstanceManager.cpp
index 1df6e90..ea30246 100644
--- a/src/openvic-simulation/InstanceManager.cpp
+++ b/src/openvic-simulation/InstanceManager.cpp
@@ -148,6 +148,16 @@ bool InstanceManager::start_game_session() {
 	return true;
 }
 
+bool InstanceManager::update_clock() {
+	if (!is_game_session_started()) {
+		Logger::error("Cannot update clock - game session not started!");
+		return false;
+	}
+
+	simulation_clock.conditionally_advance_game();
+	return true;
+}
+
 bool InstanceManager::expand_selected_province_building(size_t building_index) {
 	set_gamestate_needs_update();
 	ProvinceInstance* province = map_instance.get_selected_province();
diff --git a/src/openvic-simulation/InstanceManager.hpp b/src/openvic-simulation/InstanceManager.hpp
index 9cf346a..cfb5447 100644
--- a/src/openvic-simulation/InstanceManager.hpp
+++ b/src/openvic-simulation/InstanceManager.hpp
@@ -58,6 +58,7 @@ namespace OpenVic {
 		bool setup();
 		bool load_bookmark(Bookmark const* new_bookmark);
 		bool start_game_session();
+		bool update_clock();
 
 		bool expand_selected_province_building(size_t building_index);
 	};