diff --git a/typescript/core/base.ts b/typescript/core/base.ts
index 81ed09060d..05cc91239c 100644
--- a/typescript/core/base.ts
+++ b/typescript/core/base.ts
@@ -367,7 +367,7 @@ export interface _base {
 
     parseDateTime: (str: string, fmt: string) => Date;
 
-    getDate: (...args: number[]) => Date;
+    getDate: (...args: (number | string)[]) => Date;
 
     getTime: (...args: any[]) => number;
 }
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