When was the first printed book produced?

The Diamond Sutra, a Buddhist text, was printed in China in 868 CE and is widely regarded as the oldest surviving dated printed book. It was produced using woodblock printing, long before Gutenberg's movable-type press in Europe. The book's colophon records the date and the person who commissioned it, making it especially important to historians. Its survival shows that printing existed in East Asia many centuries before the European printing revolution. Today it is one of the treasures of the British Library.