Removed debugging
Substract to get the actual change
Converting years to days

We do this first, but we could have done it last. To avoid complicating
the code for months to days conversion.
Converting months to days

Depending on the month (28, 30 or 31 days) we add the corresponding
days and subtract one month. We do this until the month number is
grater than 0. Once the months are 0 we have our number of days
calculated.
Added the print of days

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