From c50ab2f2dfbac4f50e09acf98bafab029b4e6774 Mon Sep 17 00:00:00 2001
From: Eric Larson <larson.eric.d@gmail.com>
Date: Wed, 9 Aug 2023 15:30:35 -0400
Subject: [PATCH] FIX: Really tolerate

---
 sphinx/environment/__init__.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 37472387ddd..cb7c453b036 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -515,12 +515,16 @@ def get_outdated_files(self, config_changed: bool) -> tuple[set[str], set[str],
                                 depmtime_dt = datetime.utcfromtimestamp(depmtime)
                             except ValueError:  # e.g., year 53606865 is out of range
                                 depmtime_dt = depmtime
+                            try:
+                                mtime_dt = datetime.utcfromtimestamp(mtime)
+                            except ValueError:
+                                mtime_dt = mtime
                             logger.debug(
                                 '[build target] outdated %r '
                                 'from dependency %r: %s -> %s',
                                 docname,
                                 deppath,
-                                datetime.utcfromtimestamp(mtime),
+                                mtime_dt,
                                 depmtime_dt)
                             changed.add(docname)
                             break