Zero dated to 3rd century CE

From Oxford:

Although a number of ancient cultures including the ancient Mayans and Babylonians also used the zero placeholder, the dot’s use in the Bakhshali manuscript is the one that ultimately evolved into the symbol that we use today. India was also the place where the symbolic placeholder developed into a number in its own right, and the concept of the figure zero as it exists today, was born.

Marcus du Sautoy, Professor of Mathematics at the University of Oxford, said: ‘Today we take it for granted that the concept of zero is used across the globe and is a key building block of the digital world. But the creation of zero as a number in its own right, which evolved from the placeholder dot symbol found in the Bakhshali manuscript, was one of the greatest breakthroughs in the history of mathematics.

‘We now know that it was as early as the 3rd century that mathematicians in India planted the seed of the idea that would later become so fundamental to the modern world. The findings show how vibrant mathematics have been in the Indian sub-continent for centuries.’