When was the Act passed "to make succession to the Crown not dependant on gender" in the UK?

The Bill of Rights and the Act of Settlement (restated by the Acts of Union) still govern succession to the throne. They were amended in the United Kingdom by the Succession to the Crown Act 2013, which was passed mainly "to make succession to the Crown not depend on gender" and "to make provision about Royal Marriages" (according to its long title), thereby implementing the Perth Agreement in the UK and in those realms that, by their laws, have as their monarch automatically whoever is monarch of the UK. Other realms passed their own legislation.

Queen Elizabeth II is the sovereign, and her heir apparent is her eldest son, Charles, Prince of Wales. Next in line after him is Prince William, Duke of Cambridge, the Prince of Wales's elder son. Third in line is Prince George, the eldest child of the Duke of Cambridge, followed by his sister, Princess Charlotte, and his younger brother, Prince Louis.

Before the Act in 2013, Prince Louis would have been fourth in line to the throne ahead of his sister Princess Charlotte.