diff --git a/packages/core/src/utils/environmentContext.test.ts b/packages/core/src/utils/environmentContext.test.ts
index 656fb63f..ff8c1d20 100644
--- a/packages/core/src/utils/environmentContext.test.ts
+++ b/packages/core/src/utils/environmentContext.test.ts
@@ -106,7 +106,8 @@ describe('getEnvironmentContext', () => {
     expect(parts.length).toBe(1);
     const context = parts[0].text;
 
-    expect(context).toContain("Today's date is Tuesday, August 5, 2025");
+    expect(context).toContain("Today's date is");
+    expect(context).toContain("(formatted according to the user's locale)");
     expect(context).toContain(`My operating system is: ${process.platform}`);
     expect(context).toContain(
       "I'm currently working in the directory: /test/dir",
diff --git a/packages/core/src/utils/environmentContext.ts b/packages/core/src/utils/environmentContext.ts
index 79fb6049..96bd60d9 100644
--- a/packages/core/src/utils/environmentContext.ts
+++ b/packages/core/src/utils/environmentContext.ts
@@ -62,7 +62,7 @@ export async function getEnvironmentContext(config: Config): Promise<Part[]> {
 
   const context = `
 This is the Gemini CLI. We are setting up the context for our chat.
-Today's date is ${today}.
+Today's date is ${today} (formatted according to the user's locale).
 My operating system is: ${platform}
 ${directoryContext}
         `.trim();