5 files changed, 21 insertions, 7 deletions
diff --git a/game/environment.cpp b/game/environment.cpp
index f8da316..58a5b53 100644
--- a/game/environment.cpp
+++ b/game/environment.cpp
@@ -5,15 +5,17 @@
 
 constexpr Direction2D DONCASTER = {-1.1_degrees, 53.5_degrees};
 
-Environment::Environment() : worldTime {"2026-06-01T12:00:00"_time_t}, earthPos {DONCASTER} { }
+Environment::Environment() : worldTime {"2026-06-01T12:00:00"_seconds}, gameTimeScaleFactor {1440}, earthPos {DONCASTER}
+{
+}
 
 void
-Environment::tick(TickDuration)
+Environment::tick(TickDuration elapsed)
 {
-	worldTime += 50;
+	worldTime += std::chrono::duration_cast<WorldTime::duration>(elapsed * gameTimeScaleFactor);
 }
 
-time_t
+Environment::WorldTime
 Environment::getWorldTime() const
 {
 	return worldTime;
@@ -22,7 +24,7 @@ Environment::getWorldTime() const
 Direction2D
 Environment::getSunPos() const
 {
-	return getSunPos(earthPos, worldTime);
+	return getSunPos(earthPos, worldTime.time_since_epoch().count());
 }
 
 void
diff --git a/game/environment.h b/game/environment.h
index 271792f..94211bc 100644
--- a/game/environment.h
+++ b/game/environment.h
@@ -2,20 +2,24 @@
 
 #include "config/types.h"
 #include "worldobject.h"
+#include <chrono>
 
 class SceneRenderer;
 class SceneProvider;
 
 class Environment : public WorldObject {
 public:
+	using WorldTime = std::chrono::utc_time<std::chrono::seconds>;
+
 	Environment();
 	void tick(TickDuration elapsed) override;
 	void render(const SceneRenderer &, const SceneProvider &) const;
 	[[nodiscard]] Direction2D getSunPos() const;
-	[[nodiscard]] time_t getWorldTime() const;
+	[[nodiscard]] WorldTime getWorldTime() const;
 	[[nodiscard]] static Direction2D getSunPos(Direction2D position, time_t time);
 
 private:
-	time_t worldTime;
+	WorldTime worldTime;
+	uint16_t gameTimeScaleFactor;
 	glm::vec<2, Angle> earthPos;
 };
diff --git a/lib/chronology.cpp b/lib/chronology.cpp
index 8707bba..49f6df2 100644
--- a/lib/chronology.cpp
+++ b/lib/chronology.cpp
@@ -10,3 +10,9 @@ operator""_time_t(const char * iso, size_t)
 	}
 	return mktime(&tm);
 }
+
+std::chrono::seconds
+operator""_seconds(const char * iso, size_t)
+{
+	return std::chrono::seconds(operator""_time_t(iso, 0));
+}
diff --git a/lib/chronology.h b/lib/chronology.h
index 688a1f7..886424d 100644
--- a/lib/chronology.h
+++ b/lib/chronology.h
@@ -5,3 +5,4 @@
 
 using TickDuration = std::chrono::duration<float, std::chrono::seconds::period>;
 time_t operator""_time_t(const char * iso, size_t);
+std::chrono::seconds operator""_seconds(const char * iso, size_t);
diff --git a/ui/gameMainWindow.cpp b/ui/gameMainWindow.cpp
index 056dac3..cc81a9b 100644
--- a/ui/gameMainWindow.cpp
+++ b/ui/gameMainWindow.cpp
@@ -28,6 +28,7 @@ public:
 	render() override
 	{
 		if (IltGui::BeginToolbar("bottomBar", ImGuiDir_Down, TOOLBAR_HEIGHT)) {
+			IltGui::Text(std::format("{:%a, %H:%M\n%d %m %Y}", gameState->environment->getWorldTime()));
 			if (ImGui::ImageButton("Build rails", *buildRailsIcon, TOOLBAR_ICON_SIZE<ImVec2>)) {
 				gms->target = std::make_unique<EditNetworkOf<RailLinks>>();
 			}