From 752ed22284421b639652ebb6c0c6f53c57e419f1 Mon Sep 17 00:00:00 2001
From: Wang ChengMeng <79295644+cmw-creator@users.noreply.github.com>
Date: Wed, 10 Jun 2026 08:16:18 +0000
Subject: [PATCH] fix: support pandas >= 3.0.0 Day offset division for
 resampled time coordinates (#179)

---
 reshapr/core/extract.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/reshapr/core/extract.py b/reshapr/core/extract.py
index 7c4366b..55e4263 100644
--- a/reshapr/core/extract.py
+++ b/reshapr/core/extract.py
@@ -1001,7 +1001,11 @@ def _calc_resampled_time_coord(resampled_time_index, freq):
     # pandas 2.2.0 deprecated the M, Q & Y frequency aliases in favour of ME, QE & YE
     # We interpreted M to mean MS. Now we accept both for backward compatibility.
     if not freq.endswith(("M", "MS")):
-        offsets = pandas.tseries.frequencies.to_offset(freq) / 2
+        offset = pandas.tseries.frequencies.to_offset(freq)
+        # pandas >= 3.0.0 removed support for dividing Day offsets
+        # Use anchor timestamp to compute half-offset duration safely
+        anchor = pandas.Timestamp("2000-01-01")
+        offsets = (anchor + offset - anchor) / 2
         return resampled_time_index + offsets
     offsets = [
         pandas.tseries.frequencies.to_offset(