How I made the Tables (brief):
It was my vacation time after my 7th standard, during the summer holidays...........I was trying to make a one year calendar and was successful. Then I made calendars for the previous and the next years and found similarities between them. So, I clubbed all the three years' calendars into a single calendar.
Then I realized that it was the weekday of the January 1st of the year that the weekday of the remaining days depend on. So, I tried to make table regarding to finding the weekday of any date in the year if the weekday of the January 1st of the year is known. It had altogether 14 possibilities=7 weekdays*2 possibilities ( leap or non-leap). Later I made another table to find the weekday of the January 1st of any year in any century. Then I reduced the former table into two simpler tables and then tried to assign numerical values for each of the choice of months. At last, I could make an infinite year calendar that contained three tables and that could calculate the weekday of any date in any year and century. I made a small modification to the table that is used to find the weekday of January 1st of any year.
At last my infinite year using tables was complete.