How many seconds are there in a year?

There are 31536000 seconds in a year.
This is just a series of conversion factors.
1 year ##=(365 days)/(1 year)xx(24 hrs)/(1 day)xx(60 min)/(1 hr)xx(60 sec)/(1 min)##
You can see the all terms cancel except seconds (numerator) and year (denominator).
Plugging into a calculator ##365xx24xx60xx60=31536000##
So the answer is that there are 31536000 seconds in a year.