system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: approximately when did we start counting the year?
gpt
Depends on who you mean by "we". If you mean  how we call it 2022, that was invented in 525 but wasn't in popular use until the 9th century. The Mayans, ancient Greeks, Romans, Byzantines, China and many other societies all had their own counting systems too though.