@@ -28,8 +28,8 @@ def get_file_info(path: str, relative_to: str) -> FileInfo:
     return {
         "path": os.path.relpath(path, relative_to).replace(os.sep, '/'),
         "size": os.path.getsize(path),
-        "modified": os.path.getmtime(path),
-        "created": os.path.getctime(path)
+        "modified": int(os.path.getmtime(path) * 1000),
+        "created": int(os.path.getctime(path) * 1000),
     }
 
 
 
@@ -69,7 +69,11 @@ async def test_listuserdata_full_info(aiohttp_client, app, tmp_path):
     assert len(result) == 1
     assert result[0]["path"] == "file1.txt"
     assert "size" in result[0]
-    assert "modified" in result[0]
+    assert isinstance(result[0]["modified"], int)
+    assert isinstance(result[0]["created"], int)
+    # Verify millisecond magnitude (timestamps after year 2000 in ms are > 946684800000)
+    assert result[0]["modified"] > 946684800000
+    assert result[0]["created"] > 946684800000
 
 
 async def test_listuserdata_split_path(aiohttp_client, app, tmp_path):
Original file line number	Diff line number	Diff line change
`@@ -28,8 +28,8 @@ def get_file_info(path: str, relative_to: str) -> FileInfo:`
`28`	`28`	`return {`
`29`	`29`	`"path": os.path.relpath(path, relative_to).replace(os.sep, '/'),`
`30`	`30`	`"size": os.path.getsize(path),`
`31`		`- "modified": os.path.getmtime(path),`
`32`		`- "created": os.path.getctime(path)`
	`31`	`+ "modified": int(os.path.getmtime(path) * 1000),`
	`32`	`+ "created": int(os.path.getctime(path) * 1000),`
`33`	`33`	`}`
`34`	`34`
`35`	`35`