Caculating time line

How to calculate 2004 oct 10 – 2011 may 16

2004 oct 10

2005 oct

2006 oct

2007 oct

2008 oct

2009 oct

2010 oct  10

nov 10

dec 10

jan

feb

march

april

may 10

11

12

13

14

15

16

its 6 years 7 months 6 days

A P6 Challenging question !

John had 993 tables n chairs at first. After he sold 2/5 of the tables n 5/8 of the chairs, he had 459 tables n chairs left. How many tables did he sell?