diff --git a/comfy/cmd/execution.py b/comfy/cmd/execution.py
index 0f73af9f7..7b849218d 100644
--- a/comfy/cmd/execution.py
+++ b/comfy/cmd/execution.py
@@ -46,7 +46,7 @@ def get_good_outputs(t: QueueTuple):
 class HistoryEntry(typing.TypedDict):
     prompt: QueueTuple
     outputs: dict
-    timestamp: datetime.datetime
+    timestamp: float
 
 
 @dataclass
@@ -780,7 +780,7 @@ class PromptQueue:
         with self.mutex:
             queue_item = self.currently_running.pop(item_id)
             prompt = queue_item.queue_tuple
-            self.history[prompt[1]] = {"prompt": prompt, "outputs": {}, "timestamp": datetime.datetime.now()}
+            self.history[prompt[1]] = {"prompt": prompt, "outputs": {}, "timestamp": datetime.datetime.timestamp()}
             for o in outputs:
                 self.history[prompt[1]]["outputs"][o] = outputs[o]
             self.server.queue_updated()