From 01d5c507b857835abf18a6da3a70a8a709a6327a Mon Sep 17 00:00:00 2001
From: yu2971512385-ui <287936273+yu2971512385-ui@users.noreply.github.com>
Date: Tue, 22 Sep 2026 22:52:58 +0800
Subject: [PATCH] Fix ordinal() suffix for negative numbers

Python's % on a negative operand returns the remainder of the wrong
digit (-1 % 10 == 9), so every negative value picked the "th" suffix:
ordinal(-1) returned "-1th" and ordinal(-3) returned "-3th". Take the
last digits of the magnitude instead, which keeps the 11/12/13
exception working for negative values too.
---
 src/humanize/number.py | 6 +++++-
 tests/test_number.py   | 9 +++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/humanize/number.py b/src/humanize/number.py
index 52a5356a..57e92966 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -136,7 +136,11 @@ def ordinal(value: NumberOrString, gender: str = "male") -> str:
     except (TypeError, ValueError):
         return str(value)
     gender = "male" if gender == "male" else "female"
-    digit = 0 if value % 100 in (11, 12, 13) else value % 10
+    # Take the last digits of the magnitude: Python's % on a negative number
+    # returns a positive remainder of the wrong digit (-1 % 10 == 9), which
+    # picked the "th" suffix for every negative value, e.g. "-1th".
+    magnitude = abs(value)
+    digit = 0 if magnitude % 100 in (11, 12, 13) else magnitude % 10
     return f"{value}{P_(*_ORDINAL_SUFFIXES[gender][digit])}"
 
 
diff --git a/tests/test_number.py b/tests/test_number.py
index 5fb12fa6..9d7000c5 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -25,6 +25,15 @@
         ("102", "102nd"),
         ("103", "103rd"),
         ("111", "111th"),
+        ("-1", "-1st"),
+        ("-2", "-2nd"),
+        ("-3", "-3rd"),
+        ("-4", "-4th"),
+        ("-11", "-11th"),
+        ("-12", "-12th"),
+        ("-13", "-13th"),
+        ("-21", "-21st"),
+        ("-111", "-111th"),
         ("something else", "something else"),
         (None, "None"),
         (math.nan, "NaN"),