From 30feb2639fa1f0998a59f65959a7f0c3e15d31f8 Mon Sep 17 00:00:00 2001
From: SaharPak <sahar.pakseresht@gmail.com>
Date: Wed, 3 Jun 2026 10:03:13 +0000
Subject: [PATCH] chore: document next demo cutoff logic

Clarify that nextDemoDate treats Friday before 18:00 Helsinki time as the upcoming demo so future edits preserve the cutoff behavior.

Co-authored-by: Sahar <SaharPak@users.noreply.github.com>
---
 src/lib/week.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/lib/week.ts b/src/lib/week.ts
index 96ae04a..88aefcf 100644
--- a/src/lib/week.ts
+++ b/src/lib/week.ts
@@ -31,6 +31,10 @@ export function currentWeekOf(): string {
   return format(startOfWeek(now, { weekStartsOn: 1 }), "yyyy-MM-dd");
 }
 
+/**
+ * Returns the next Friday 18:00 Helsinki demo cutoff.
+ * Before that hour on Friday, the current day is still the next demo.
+ */
 export function nextDemoDate(): Date {
   const now = helsinkiNow();
   if (isFriday(now) && now.getHours() < 18) {