Question
What was the date 1 arab/1 billion seconds ago?

Answer

1 billion seconds $=1,000,000,000$ seconds
$1,000,000,000 \div(60 \times 60 \times 24 \times 365)=31.71$ years
31.71 years $=31$ full years and $0.71 \times 365=259$ days
Today is : 28 July 2025
Subtracting 31 years $\rightarrow 28$ July 1994
Going back 259 days from 28 July $1994 \rightarrow 11$ November 1993.
So, 1 billion seconds ago was November 11, 1993.

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