eli5 When did humanity start counting time?

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I’m sure I haven’t asked the question correctly, but if all the clocks in the world are aligned, when did we start it? How did the entire world agree that midnight is midnight and any second behind or ahead is out of line?

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Anonymous 0 Comments

In 1880 Greenwich Royal Observatory. This was chosen as the Prime meridian. All time zones are counted from there.
The clock on the observatory was officially declared as the exact time
So 12 noon in Greenwich England is where all time in the world was first agreed as being “The Time”.

https://greenwichmeantime.com/what-is-gmt/

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