From b13f9560991705c8d974c80b67dfc3dbb3ad90fe Mon Sep 17 00:00:00 2001
From: aleksei <aleksei@zeroday.su>
Date: Mon, 8 Jun 2026 16:32:51 +0300
Subject: [PATCH] =?UTF-8?q?fix(calendar):=20isoDay=20use=20local=20date=20?=
 =?UTF-8?q?parts=20=E2=80=94=20fixes=20MSK=20off-by-one=20day=20grouping?=
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---
 components/CalendarView.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/components/CalendarView.js b/components/CalendarView.js
index 65b1d45..1d2f40c 100644
--- a/components/CalendarView.js
+++ b/components/CalendarView.js
@@ -57,7 +57,11 @@ function formatDate(iso) {
 }
 
 function isoDay(date) {
-  return date.toISOString().slice(0, 10);
+  // Ключ локального дня (НЕ UTC) — иначе в МСК события смещаются на день
+  const y = date.getFullYear();
+  const m = String(date.getMonth() + 1).padStart(2, '0');
+  const d = String(date.getDate()).padStart(2, '0');
+  return `${y}-${m}-${d}`;
 }
 
 // ── EventCard ────────────────────────────────────────────────────────────────