 References to the monarch are commonplace in public life in the Cook Islands.There are references to the Crown in legal documents, Oaths of office taken by the Queen's Representative, Members of Parliament and Judges of the High Court, and prescriptions in the Constitution require allegiance to be sworn to the reigning Sovereign as the Head of State of the Cook Islands.Unlike in the United Kingdom, the Queen's Official Birthday is a public holiday on the first Monday in June.