元旦节皮肤

client/src/lib/festival.ts

@@ -6,7 +6,7 @@
    ============================================================ */
 import { useMemo } from "react";
 
-export type FestivalId = "christmas" | "halloween";
+export type FestivalId = "christmas" | "halloween" | "newyear";
 
 /** Inclusive [month, day] windows. Christmas: Dec 20 – Dec 26; Halloween: Oct 26 – Nov 1. */
 const FESTIVAL_WINDOWS: Record<
@@ -15,6 +15,8 @@ const FESTIVAL_WINDOWS: Record<
 > = {
   christmas: { from: [12, 20], to: [12, 26] },
   halloween: { from: [10, 26], to: [11, 1] },
+  // 元旦接续圣诞节，跨年窗口包含首尾日期。
+  newyear: { from: [12, 27], to: [1, 3] },
 };
 
 function inWindow(
@@ -55,8 +57,14 @@ export function useFestival(): FestivalId | null {
   return useMemo(() => getFestival(), []);
 }
 
+/** 跨年夜展示即将到来的年份，其余月份预览展示当年。 */
+export function getNewYearDisplayYear(now: Date = new Date()): number {
+  return now.getFullYear() + (now.getMonth() === 11 ? 1 : 0);
+}
+
 /** 首页 VU 区的节日问候语，键与 FestivalId 对应。 */
 export const FESTIVAL_GREETINGS: Record<FestivalId, string> = {
   christmas: "Merry Christmas",
   halloween: "Happy Halloween",
+  newyear: "Happy New Year",
 };