From 1f9845b72a9d8758322b0a0a6ae51504897dbf57 Mon Sep 17 00:00:00 2001
From: Bryce Lampe <brycelampe@gmail.com>
Date: Sat, 21 Mar 2026 07:35:40 -0700
Subject: [PATCH] Plan UI: Fix inaccurate day formatting for negative TZs
 (#28433)

Co-authored-by: Michael Geers <michael@geers.tv>
---
 assets/js/mixins/formatter.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/assets/js/mixins/formatter.ts b/assets/js/mixins/formatter.ts
index 6e694b932..bf946f769 100644
--- a/assets/js/mixins/formatter.ts
+++ b/assets/js/mixins/formatter.ts
@@ -379,12 +379,12 @@ export default defineComponent({
       const day = index === 0 ? 6 : 6 + index;
       return new Intl.DateTimeFormat(this.$i18n?.locale, {
         weekday: format,
-      }).format(new Date(Date.UTC(2021, 5, day)));
+      }).format(new Date(2021, 5, day)); // local date avoids UTC timezone day shift
     },
     fmtMonthByIndex(index: number, format: Intl.DateTimeFormatOptions["month"]) {
       return new Intl.DateTimeFormat(this.$i18n?.locale, {
         month: format,
-      }).format(new Date(Date.UTC(2021, index, 1)));
+      }).format(new Date(2021, index, 1)); // local date avoids UTC timezone day shift
     },
     getWeekdaysList(
       format: Intl.DateTimeFormatOptions["weekday"]