Question

I didn't understand how 1hr became 3600 secs​

Answer 1

Answer: In a "regular" year, there are 365 days. There are 60 * 60 = 3600 seconds in an hour. There are 3600 * 4 = 86400 seconds in a day. Thus, there are 86400 * 365 = 31,536,000 seconds in a regular year.