From fe83ce9243715c02c13dfe4cc5bcce463f2de0c3 Mon Sep 17 00:00:00 2001
From: William Ayd <will_ayd@innobi.io>
Date: Mon, 13 Nov 2023 13:53:11 -0500
Subject: [PATCH] Backport PR #55920: Fix off-by-one in aggregations

---
 pandas/core/indexers/objects.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/indexers/objects.py b/pandas/core/indexers/objects.py
index 694a420ad2494..b516227cf8b06 100644
--- a/pandas/core/indexers/objects.py
+++ b/pandas/core/indexers/objects.py
@@ -102,7 +102,7 @@ def get_window_bounds(
         closed: str | None = None,
         step: int | None = None,
     ) -> tuple[np.ndarray, np.ndarray]:
-        if center:
+        if center or self.window_size == 0:
             offset = (self.window_size - 1) // 2
         else:
             offset = 0