[backend] fix: 修复异常处理和类型转换问题

frontend/node_modules/dayjs/plugin/utc.d.ts

@@ -0,0 +1,19 @@
+import { PluginFunc, ConfigType } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs' {
+  interface Dayjs {
+    
+    utc(keepLocalTime?: boolean): Dayjs
+    
+    local(): Dayjs
+
+    isUTC(): boolean
+
+    utcOffset(offset: number | string, keepLocalTime?: boolean): Dayjs
+  }
+
+  export function utc(config?: ConfigType, format?: string, strict?: boolean): Dayjs
+}