diff --git a/package.json b/package.json
index 86746b1..2cd925e 100644
--- a/package.json
+++ b/package.json
@@ -37,5 +37,10 @@
     "typescript": "^6.0.3",
     "typescript-eslint": "^8.62.1",
     "zod": "^4.4.3"
+  },
+  "dependencies": {
+    "@langchain/google-genai": "^2.2.0",
+    "@types/node": "^20.19.43",
+    "dotenv": "^17.4.2"
   }
 }
diff --git a/packages/core/package.json b/packages/core/package.json
index f454ca1..7f9598b 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -7,6 +7,8 @@
     ".": "./dist/index.js"
   },
   "dependencies": {
+    "@langchain/google-genai": "^2.2.0",
+    "@types/node": "^26.1.0",
     "better-sqlite3": "^12.11.1"
   }
 }
diff --git a/packages/core/src/clock.ts b/packages/core/src/clock.ts
new file mode 100644
index 0000000..feac19e
--- /dev/null
+++ b/packages/core/src/clock.ts
@@ -0,0 +1,19 @@
+export class WorldClock {
+  private currentTime: Date;
+
+  constructor(startTime: Date = new Date(1999, 4, 14, 18, 0)) {
+    this.currentTime = startTime;
+  }
+
+  advance(minutes: number): void {
+    this.currentTime = new Date(this.currentTime.getTime() + minutes * 60_000);
+  }
+
+  get(): Date {
+    return this.currentTime;
+  }
+
+  static fromISOString(iso: string): WorldClock {
+    return new WorldClock(new Date(iso));
+  }
+}
diff --git a/packages/core/src/world.ts b/packages/core/src/world.ts
index e5cc509..50f4801 100644
--- a/packages/core/src/world.ts
+++ b/packages/core/src/world.ts
@@ -1,5 +1,6 @@
 import { AttributableObject } from "./attribute.js";
 import { Entity } from "./entity.js";
+import { WorldClock } from "./clock.js";
 
 export class WorldState extends AttributableObject {
   /**
@@ -7,9 +8,11 @@ export class WorldState extends AttributableObject {
    * Universe's current state (distinct from how it started)
    */
   readonly entities: Map<string, Entity> = new Map();
+  readonly clock: WorldClock;
 
-  constructor(id?: string) {
+  constructor(id?: string, startTime?: Date) {
     super(id);
+    this.clock = new WorldClock(startTime);
   }
 
   addEntity(entity: Entity): void {