From f7625f811d822d285fa0bd458f1463aad1f04b4d Mon Sep 17 00:00:00 2001
From: wavebyrd <160968744+wavebyrd@users.noreply.github.com>
Date: Sat, 17 Oct 2026 09:11:56 +0000
Subject: [PATCH] Observe New Year's Day on 3 January in the New Zealand
 calendar when 1 January is a Sunday

---
 financepy/utils/calendar.py                           |  4 ++++
 .../regression/golden/TestFinCalendar_GOLDEN.testLog  |  1 +
 tests/unit/test_FinCalendar.py                        | 11 +++++++++++
 3 files changed, 16 insertions(+)

diff --git a/financepy/utils/calendar.py b/financepy/utils/calendar.py
index ab200891..4ad58550 100644
--- a/financepy/utils/calendar.py
+++ b/financepy/utils/calendar.py
@@ -1857,6 +1857,10 @@ def holiday_new_zealand(self, dt: Date, day_in_year: int, weekday: int):
         if m == 1 and d == 3 and weekday == Date.MON:
             return True
 
+        # Jan 1 Sunday -> Jan 3 Tuesday (Jan 2 is the Monday holiday)
+        if m == 1 and d == 3 and weekday == Date.TUE:
+            return True
+
         if m == 1 and d == 4 and weekday in (Date.MON, Date.TUE):
             return True
 
diff --git a/tests/regression/golden/TestFinCalendar_GOLDEN.testLog b/tests/regression/golden/TestFinCalendar_GOLDEN.testLog
index 6cfebee5..a843a301 100644
--- a/tests/regression/golden/TestFinCalendar_GOLDEN.testLog
+++ b/tests/regression/golden/TestFinCalendar_GOLDEN.testLog
@@ -1933,6 +1933,7 @@ RESULTS,NEW_ZEALAND,TUE DEC 27 2022,
 BANNER,================================
 RESULTS,NEW_ZEALAND,SUN JAN 01 2023,
 RESULTS,NEW_ZEALAND,MON JAN 02 2023,
+RESULTS,NEW_ZEALAND,TUE JAN 03 2023,
 RESULTS,NEW_ZEALAND,MON FEB 06 2023,
 RESULTS,NEW_ZEALAND,FRI APR 07 2023,
 RESULTS,NEW_ZEALAND,MON APR 10 2023,
diff --git a/tests/unit/test_FinCalendar.py b/tests/unit/test_FinCalendar.py
index 85633661..355c92a6 100644
--- a/tests/unit/test_FinCalendar.py
+++ b/tests/unit/test_FinCalendar.py
@@ -214,6 +214,17 @@ def test_uk_moved_bank_holidays(cal_type):
         assert cal.is_holiday(dt), dt
 
 
+def test_nz_new_year_on_sunday_observed_on_tuesday():
+    cal = Calendar(CalendarTypes.NEW_ZEALAND)
+
+    # 1 January falls on a Sunday, so 2 January (Monday) is the day after
+    # New Year's Day and New Year's Day itself is observed on 3 January
+    for y in [2006, 2012, 2017, 2023]:
+        assert cal.is_holiday(Date(2, 1, y)), y
+        assert cal.is_holiday(Date(3, 1, y)), y
+        assert cal.is_business_day(Date(4, 1, y)), y
+
+
 def test_modified_following_does_not_cross_month():
     cal = Calendar(CalendarTypes.WEEKEND)