diff --git a/src/game/engine/scenes/tests/auto_play.gd b/src/game/engine/scenes/tests/auto_play.gd
index b1061c67..c166b68e 100644
--- a/src/game/engine/scenes/tests/auto_play.gd
+++ b/src/game/engine/scenes/tests/auto_play.gd
@@ -26,6 +26,7 @@ var _last_army_pos: Vector2i = Vector2i(-1, -1)
 var _seed: int = 0
 var _seed_set: bool = false
 var _start_time: float = 0.0
+var _start_stamp: String = ""
 var _victory_winner: int = -1
 var _victory_type: String = ""
 var _outcome: String = "in_progress"
@@ -51,7 +52,12 @@ func _ready() -> void:
 		_seed_set = true
 		seed(_seed)
 		GameState.game_settings["seed"] = _seed
-		print("AutoPlay: seed=%d" % _seed)
+		var now: Dictionary = Time.get_datetime_dict_from_system(true)
+		_start_stamp = "%04d%02d%02dT%02d%02d%02dZ" % [
+			now["year"], now["month"], now["day"],
+			now["hour"], now["minute"], now["second"],
+		]
+		print("AutoPlay: seed=%d stamp=%s" % [_seed, _start_stamp])
 
 	_start_time = Time.get_unix_time_from_system()
 	EventBus.victory_achieved.connect(_on_victory)
@@ -1092,7 +1098,7 @@ func _write_result() -> void:
 		"invariant_violations": _violations,
 	}
 	DirAccess.make_dir_recursive_absolute(_output_dir)
-	var path: String = _output_dir.path_join("result_%d.json" % _seed)
+	var path: String = _output_dir.path_join("result_%s_seed%d.json" % [_start_stamp, _seed])
 	var file: FileAccess = FileAccess.open(path, FileAccess.WRITE)
 	if file == null:
 		push_error("AutoPlay: cannot open %s for writing" % path)