So if you want to calculate my future...Time, they suppose to be doing, that will start at 1983

456789 10 = 7 years at 1990 April

Like you hating your own birthday?

Or you can always do this

1908 Jan to 1910 Jan = 2 years, right? So you can literally say 1910-1908=2 years 

This 1910 whole year does not count.

Now 1943-1908=35

35-6 month +1 week....

You will know that is the right way to do, too.