Explanation : The year 2012 is a leap year. Thus, it has 2 odd
days.
But as calculation is to be done from April 22, 2012, till
April 22, 2013, so it has 1 odd day only. As the calculation is to be done backwards, thus April 22nd was one
day less. Thus, it was Sunday.
Note: Had the question been about April 22, 2014, the
answer would have been Tuesday. If the same question is
framed for April 22, 2016, the answer would have been
Friday, as 2016 is a leap year.