From 7ee4003840c02b423399004860a2c583d327cc22 Mon Sep 17 00:00:00 2001
From: daboe01 <daboe01@googlemail.com>
Date: Sun, 1 Feb 2026 19:29:59 +0100
Subject: [PATCH] fixed: prevent timezone shift from reverting month navigation
 in _CPDatePickerCalendar

---
 AppKit/CPDatePicker/_CPDatePickerCalendar.j | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/AppKit/CPDatePicker/_CPDatePickerCalendar.j b/AppKit/CPDatePicker/_CPDatePickerCalendar.j
index af43569b3..101185add 100644
--- a/AppKit/CPDatePicker/_CPDatePickerCalendar.j
+++ b/AppKit/CPDatePicker/_CPDatePickerCalendar.j
@@ -251,7 +251,15 @@
 
 - (void)_displayNextMonth
 {
-     [self setDateValue:[_monthView nextMonth]];
+    // Copy the date so we don't modify the view's state directly
+    var nextDate = [[_monthView nextMonth] copy];
+    
+    // Set to the middle of the month (15th).
+    // This prevents [setDateValue:]'s timezone adjustment from 
+    // shifting the date back into the previous month (e.g., Nov 1 -> Oct 31).
+    nextDate.setDate(15);
+    
+    [self setDateValue:nextDate];
 }
 
 - (void)_displayPreviousMonth