diff --git a/promptulate/schema.py b/promptulate/schema.py
index 6c6adba0..2c587f05 100644
--- a/promptulate/schema.py
+++ b/promptulate/schema.py
@@ -24,6 +24,7 @@ class BaseMessage(BaseModel):
 
     content: str
     additional_kwargs: dict = Field(default_factory=dict)
+    created_at: datetime = Field(default_factory=datetime.now)
 
     @property
     @abstractmethod