@Arden Thank you for your very helpful answer!
>1000 * 60 seconds * 60 minutes * 24 hours * 365 days = 31,536,000,000.
This is not considered about a leap years.
I believe the formula below is better
1000 * 60 seconds * 60 minutes * 24 hours * 365.25 days = 31,557,600,000