Sorry if this is in the wrong place.
Why did humans begin to record time and how did the whole world agree on a standard (24hrs etc.). I know the romans made a 10 month calendar into 12 months, but where did the 10 month calendar come from, and how did the world all take on the 12 month standard.
hi! This sub is fine for these questions. Your first questions, how and why did humans start recording time, are really more the realm of our sister sub /r/AskAnthropology; there are some anthropologists here, and you may get answers here, but it would be worth x-posting over there to get their take on it. Anyway, questions about time-keeping are popular in this sub, so you can get started on this post
and this section of the FAQ