From 685d378a681c57f48c75c58364dc4873f421ef87 Mon Sep 17 00:00:00 2001
From: MildlyMeticulous <302576729+MildlyMeticulous@users.noreply.github.com>
Date: Fri, 24 Jul 2026 22:06:53 -0700
Subject: [PATCH] fix: correct ordinal suffix for negative numbers

Python % is not sign-symmetric: -1 % 10 is 9, so ordinal(-1) selected the
"th" suffix and returned "-1th" instead of "-1st". Take the suffix from
abs(value); -11 through -13 still correctly get "th".
---
 src/humanize/number.py |  5 ++++-
 tests/test_number.py   | 10 ++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/humanize/number.py b/src/humanize/number.py
index 2fb22c6..4e7fb3f 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -109,7 +109,10 @@ 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
+    # The suffix follows the magnitude, and Python's % is not sign-symmetric:
+    # -1 % 10 is 9, which would pick "th" instead of "st".
+    magnitude = abs(value)
+    digit = 0 if magnitude % 100 in (11, 12, 13) else magnitude % 10
     return f"{value}{P_(f'{digit} ({gender})', _ORDINAL_SUFFIXES[digit])}"
 
 
diff --git a/tests/test_number.py b/tests/test_number.py
index 78639c3..8ebf0ea 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -25,6 +25,16 @@
         ("102", "102nd"),
         ("103", "103rd"),
         ("111", "111th"),
+        ("-1", "-1st"),
+        ("-2", "-2nd"),
+        ("-3", "-3rd"),
+        ("-4", "-4th"),
+        ("-11", "-11th"),
+        ("-12", "-12th"),
+        ("-13", "-13th"),
+        ("-21", "-21st"),
+        ("-101", "-101st"),
+        ("-111", "-111th"),
         ("something else", "something else"),
         (None, "None"),
         (math.nan, "NaN"),