Article 48 Vienna Convention on Diplomatic Relations

The present Convention shall be open for signature by all States Members of the United Nations or of any of the specialized agencies Parties to the Statute of the International Court of Justice, and by any other State invited by the General Assembly of the United Nations to become a Party to the Convention, as follows: until 31 October 1961 at the Federal Ministry for Foreign Affairs of Austria and
subsequently, until 31 March 1962, at the United Nations Headquarters in New York.

See also: Article 47 Vienna Convention on Diplomatic Relations