From a2712839d0d64b902b3ecf524b0d317c9c1f96b9 Mon Sep 17 00:00:00 2001
From: kittapath <>
Date: Wed, 22 Oct 2025 23:20:48 +0700
Subject: [PATCH] update timezone

---
 src/app.ts                        |  4 ++++
 src/interfaces/date-serializer.ts | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 src/interfaces/date-serializer.ts

diff --git a/src/app.ts b/src/app.ts
index 840d5de..b591ddc 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -10,10 +10,14 @@ import { AppDataSource } from "./database/data-source";
 import { RegisterRoutes } from "./routes";
 import { SalaryPeriodController } from "./controllers/SalaryPeriodController";
 import logMiddleware from "./middlewares/logs";
+import { DateSerializer } from "./interfaces/date-serializer";
 
 async function main() {
   await AppDataSource.initialize();
 
+  // Setup custom Date serialization for local timezone
+  DateSerializer.setupDateSerialization();
+
   const app = express();
 
   app.use(
diff --git a/src/interfaces/date-serializer.ts b/src/interfaces/date-serializer.ts
new file mode 100644
index 0000000..5c876ff
--- /dev/null
+++ b/src/interfaces/date-serializer.ts
@@ -0,0 +1,24 @@
+// Custom Date serializer for local timezone
+export class DateSerializer {
+  static toLocalTime(date: Date): string | null {
+    if (!date) return null;
+
+    // Convert UTC date to Thailand timezone (+07:00)
+    const offset = 7 * 60; // Thailand is UTC+7
+    const localTime = new Date(date.getTime() + offset * 60 * 1000);
+
+    // Format as ISO string but replace Z with +07:00
+    const isoString = localTime.toISOString();
+    return isoString.replace("Z", "+07:00");
+  }
+
+  static setupDateSerialization() {
+    // Override Date.prototype.toJSON to use local time
+    Date.prototype.toJSON = function () {
+      const offset = 7 * 60; // Thailand timezone offset in minutes
+      const localTime = new Date(this.getTime() + offset * 60 * 1000);
+      const isoString = localTime.toISOString();
+      return isoString.replace("Z", "+07:00");
+    };
+  }
+}