diff --git a/cogs/sacrifice/sacrifice.py b/cogs/sacrifice/sacrifice.py
index 46e0b9c..78579d1 100644
--- a/cogs/sacrifice/sacrifice.py
+++ b/cogs/sacrifice/sacrifice.py
@@ -160,8 +160,8 @@ class SacrificeCog(commands.Cog):
 
     async def save_history(self, winner_id: str, looser_id: str):
         history = await self.config.onevone_game_history()
-        winner_result = {"date": datetime.datetime.now(), "opponent": looser_id, "result": 1}
-        looser_result = {"date": datetime.datetime.now(), "opponent": winner_id, "result": 0}
+        winner_result = {"date": datetime.datetime.now().isoformat(), "opponent": looser_id, "result": 1}
+        looser_result = {"date": datetime.datetime.now().isoformat(), "opponent": winner_id, "result": 0}
         if winner_id not in history:
             history[winner_id] = [winner_result]
         else: