diff --git a/docs/KRVAVA_ZETEV_FINAL_TASKS.md b/docs/KRVAVA_ZETEV_FINAL_TASKS.md
index 44fe6fe..bbe9afb 100644
--- a/docs/KRVAVA_ZETEV_FINAL_TASKS.md
+++ b/docs/KRVAVA_ZETEV_FINAL_TASKS.md
@@ -98,28 +98,32 @@
 
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-### **P18: DAY/NIGHT CYCLE** (20 hours) ⏰
+### **P18: DAY/NIGHT CYCLE** ✅ **COMPLETE!** (23.12.2025)
 
-- [ ] **18.1 - Time System (25-min days)**
+- [x] **18.1 - Time System (25-min days)** ✅
   - Precise timing (6.25, 4.17 min segments)
   - Day/night transitions
-  - **Estimate:** 5 hours
+  - **System:** TimeSystem.js ✅
 
-- [ ] **18.2 - Lighting System**
+- [x] **18.2 - Lighting System** ✅
   - Dynamic light changes
   - Shadows, ambient colors
-  - **Estimate:** 6 hours
+  - **System:** TimeSystem.js ✅
 
-- [ ] **18.3 - Time-Based Gameplay**
+- [x] **18.3 - Time-Based Gameplay** ✅
   - Morning: Zombie +20% efficiency
   - Night: 2x hostile spawns, werewolf
   - Insomnia penalties
-  - **Estimate:** 6 hours
+  - **System:** TimeSystem.js ✅
 
-- [ ] **18.4 - Sleep System**
+- [x] **18.4 - Sleep System** ✅
   - Bed mechanics, save game
   - Collapse at 2AM if don't sleep
-  - **Estimate:** 3 hours
+  - **System:** TimeSystem.js ✅
+
+**Status:** ✅ **COMPLETE!** - TimeSystem.js (500 LOC)
+**File:** src/systems/TimeSystem.js
+**Features:** 25-min days, 4 time periods, dynamic lighting, zombie bonuses, werewolves, sleep/collapse, seasons
 
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