difference-between-years-level-1

Difference between years. (Level 1)

Write a function that receives two strings as parameter. These strings are in the following format of date: YYYY/MM/DD. Your job is: Take the years and calculate the difference between them.

Examples:

'1997/10/10' and '2015/10/10' -> 2015 - 1997 = returns 18 
'2015/10/10' and '1997/10/10' -> 2015 - 1997 = returns 18

At this level, you don't need to validate months and days to calculate the difference.