Input (grade 13): The first stone of the Hall was laid by Her Majesty Queen Victoria on the twentieth day of May MDCCCLXVII and it was opened by Her Majesty the Twenty Ninth of March in the year MDCCCLXXI.
Output (grade 8): It says that the first stone was laid by Her Majesty Queen Victoria on 20 May 1867 and was opened by her on 29 March 1871.