From 2fb9380b342556ddb50a4b24e4fe8655d548b2b8 Mon Sep 17 00:00:00 2001
From: Linlang <30293408+SunsetWolf@users.noreply.github.com>
Date: Thu, 12 Feb 2026 21:07:15 +0800
Subject: [PATCH] fix(backtest): avoid calendar overflow when end_time is
 missing (#2127)

* fix(backtest): avoid calendar overflow when end_time is missing

* fix: pkg_source not found error when build docs
---
 docs/conf.py                 | 6 +++---
 qlib/workflow/record_temp.py | 8 +++++++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/docs/conf.py b/docs/conf.py
index f1377c140..7c638e736 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -21,7 +21,7 @@
 import os
 import sys
 
-import pkg_resources
+from importlib.metadata import version as ver
 
 
 # -- General configuration ------------------------------------------------
@@ -63,9 +63,9 @@ author = "Microsoft"
 # built documents.
 #
 # The short X.Y version.
-version = pkg_resources.get_distribution("pyqlib").version
+version = ver("pyqlib")
 # The full version, including alpha/beta/rc tags.
-release = pkg_resources.get_distribution("pyqlib").version
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/qlib/workflow/record_temp.py b/qlib/workflow/record_temp.py
index 844914d46..79c4a78f8 100644
--- a/qlib/workflow/record_temp.py
+++ b/qlib/workflow/record_temp.py
@@ -476,7 +476,13 @@ class PortAnaRecord(ACRecordTemp):
         if self.backtest_config["start_time"] is None:
             self.backtest_config["start_time"] = dt_values.min()
         if self.backtest_config["end_time"] is None:
-            self.backtest_config["end_time"] = get_date_by_shift(dt_values.max(), 1)
+            self.backtest_config["end_time"] = get_date_by_shift(dt_values.max(), -1)
+            warnings.warn(
+                "No explicit backtest end_time provided. "
+                "Qlib requires one extra calendar step to determine the right boundary of a bar. "
+                "Therefore the end_time is shifted backward by one trading day from "
+                f"{dt_values.max()} -> {self.backtest_config['end_time']}."
+            )
 
         artifact_objects = {}
         # custom strategy and get backtest