Why humans know very little about time prior to the ancient era?

Humans know very little about time prior to the ancient era primarily due to the lack of written records and historical documentation from earlier periods. Prehistoric societies relied on oral traditions, which don't provide the same concrete evidence as written texts. Additionally, archaeological evidence from these times can be scarce and open to interpretation, making it challenging to construct a coherent timeline. As a result, our understanding of early human history is often fragmented and incomplete.