Manipulating tm_mon in struct tm?

Question

I\'m having trouble understanding this program, namely the tm_mon +1 part.

I am new to C and I normally always write my own little programs for any challeng

Answer 1

Take a look at the following table. As you can see tm_mon is a value from 0=january to 11=december.

'*' tm_sec is generally 0-59. The extra range is to accommodate for leap seconds in certain systems.

EDIT

Then in your case without +1 in case of date 1/1/2015 the real output will be

The date in 4,000,000 seconds will be 0/1/2015

With +1 will propel output

The date in 4,000,000 seconds will be 1/1/2015