From d123f6cc62d067c34248c29d9248c955727ed1f4 Mon Sep 17 00:00:00 2001
From: AMelonInsideLemon <166175391+AMelonInsideLemon@users.noreply.github.com>
Date: Fri, 4 Apr 2025 03:22:32 +0200
Subject: [PATCH] correct rotation timestamp

---
 .../dynamic/worldStateController.ts           |  3 ++-
 src/helpers/worlstateHelper.ts                | 26 +++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/controllers/dynamic/worldStateController.ts b/src/controllers/dynamic/worldStateController.ts
index 82313183..1c738117 100644
--- a/src/controllers/dynamic/worldStateController.ts
+++ b/src/controllers/dynamic/worldStateController.ts
@@ -11,6 +11,7 @@ import { config } from "@/src/services/configService";
 import { CRng } from "@/src/services/rngService";
 import { ExportNightwave, ExportRegions } from "warframe-public-export-plus";
 import {
+    getTorontoTimeAtHour,
     missionTags,
     sortieBosses,
     sortieBossNode,
@@ -165,7 +166,7 @@ export const worldStateController: RequestHandler = (req, res) => {
 
     // Sortie cycling every day
     {
-        const dayStart = EPOCH + day * 86400000;
+        const dayStart = getTorontoTimeAtHour(EPOCH + day * 86400000, 12);
         const dayEnd = dayStart + 86400000;
 
         const rng = new CRng(day);
diff --git a/src/helpers/worlstateHelper.ts b/src/helpers/worlstateHelper.ts
index 4b4554f0..e6d83b74 100644
--- a/src/helpers/worlstateHelper.ts
+++ b/src/helpers/worlstateHelper.ts
@@ -112,3 +112,29 @@ export const sortieBossNode: Record<string, string> = {
     SORTIE_BOSS_LEPHANTIS: "SolNode712",
     SORTIE_BOSS_INFALAD: "SolNode705"
 };
+
+// ChatGPT generated that. And seems it works fine
+export const getTorontoTimeAtHour = (date: number, hour: number): number => {
+    const formatter = new Intl.DateTimeFormat("en-US", {
+        timeZone: "America/Toronto",
+        year: "numeric",
+        month: "2-digit",
+        day: "2-digit"
+    });
+
+    const parts = formatter.formatToParts(date).reduce<Record<string, string>>((acc, { type, value }) => {
+        if (["year", "month", "day"].includes(type)) {
+            acc[type] = value;
+        }
+        return acc;
+    }, {});
+
+    const assumedLocalDate = new Date(
+        `${parts.year}-${parts.month}-${parts.day}T${hour.toString().padStart(2, "0")}:00:00`
+    );
+
+    const localDate = new Date(assumedLocalDate.toLocaleString("en-US", { timeZone: "America/Toronto" }));
+    const offsetMs = assumedLocalDate.getTime() - localDate.getTime();
+
+    return assumedLocalDate.getTime() + offsetMs;
+};