feat: backend side of timezone convert, new route created for using luxon to convert timezones

backend/src/routes/tmzconvert.route.ts

@@ -0,0 +1,45 @@
+import { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import { DateTime } from "luxon";
+
+interface RequestBody {
+  time: string;
+  fromZone: string;
+  toZone: string;
+}
+
+export async function tmzConvert(app: FastifyInstance) {
+  app.post(
+    "/api/tmz-convert",
+    async (
+      request: FastifyRequest<{ Body: RequestBody }>,
+      reply: FastifyReply,
+    ) => {
+      const data = request.body;
+      const time = data.time;
+      const fromZone = data.fromZone;
+      const toZone = data.toZone;
+
+      try {
+        if (!time || !fromZone || !toZone) {
+          return reply.status(400).send({ error: "Missing parameters" });
+        }
+
+        const dateTime = DateTime.fromISO(time, { zone: fromZone });
+
+        if (!dateTime.isValid) {
+          return reply.status(400).send({ error: "Invalid date or time zone" });
+        }
+
+        const convertedTime = dateTime.setZone(toZone).toISO();
+
+        return reply
+          .header("Content-Type", "text/plain")
+          .status(200)
+          .send(convertedTime);
+      } catch (error) {
+        console.error("Conversion error:", error);
+        reply.status(500).send({ error: "Error converting time" });
+      }
+    },
+  );
+}