History & Timewarp: Does Time Change Earth's History?

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Is the time period of a second on Earth today the same as it was millions of years ago or even when the universe began? If not would that change how one perceives the timeline of Earth's history?
 
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How long is a second?

There weren't any seconds back when. Time was measured in how much time it took to get the the next mangrove tree. Seconds would take a lot of walks to the mangroves tree before they would come to around.

And welcome to Physics Forum.
 
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A second is just an arbitrarily chosen time interval that allows one to make quantitative statements about time.
 
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