The United Nations records Malaysia's date of admission as 17-09-1957
Background
The United Nations member states list records Malaysia's Date of Admission as 17-09-1957.
The Commonwealth records that Malaysia joined the Commonwealth in 1957, following the Federation of Malaya's independence from Britain.
The Commonwealth country page gives Malaysia's area as 330,000 square kilometres and its capital city as Kuala Lumpur.
It gives Malaysia's population as 32.37 million, for the year 2022.
Malaysia therefore entered both the United Nations and the Commonwealth in the same year as independence.
In plain words
Federation of Malaya Federation of Malaya — The state that became independent from Britain and later formed the core of Malaysia.