feat: increase support for multiple time zones

* 优化实现方法

playground/src/api/core/index.ts

@@ -1,3 +1,4 @@
 export * from './auth';
 export * from './menu';
+export * from './timezone';
 export * from './user';

playground/src/api/core/timezone.ts

@@ -0,0 +1,30 @@
+import type { TimezoneOption } from '@vben/types';
+
+import { requestClient } from '#/api/request';
+
+/**
+ * 获取系统支持的时区列表
+ */
+export async function getTimezoneOptionsApi() {
+  const dataList =
+    (await requestClient.get<TimezoneOption[]>(
+      '/timezone/getTimezoneOptions',
+    )) || [];
+  return dataList.map((item) => ({
+    label: item.timezone,
+    value: item.timezone,
+  }));
+}
+/**
+ * 获取用户时区
+ */
+export async function getTimezoneApi(): Promise<null | string | undefined> {
+  return requestClient.get<null | string | undefined>('/timezone/getTimezone');
+}
+/**
+ * 设置用户时区
+ * @param timezone 时区
+ */
+export async function setTimezoneApi(timezone: string) {
+  return requestClient.post('/timezone/setTimezone', { timezone });
+}