On 1st April 2001, Guppy’s watch will correctly show the date as ‘1’ as March has 31 days only. From 1st April 2001 to 30th April 2002 a total of 13 months or 365 + 30 = 395 days would have passed. So the date shown by Guppy’s watch on 30th April, 2002 must be395−12×31=23. Subsequently his watch will show the date as ’24’ on 1st May, ‘1’ on 9th May and '7 ’ on 15th May, 2002.