The Mayans used it in their dating system and the earliest known usage has been dated to 36 BC.
'Our' zero comes to us from India. We do not know who the person was who devised the concept, but Brahmagupta wrote a book which included rules for its use.
The ancient Greeks were aware of the concept of 'nothing', but did not have a formal way fo representing it in calculations.
The 'clever bit' about how we use 0 is in the positional-value we assign to it and to the other numbers.
When the Indian zero was first used in unknown but the earliest dated reference we have for it is 458 AD.