81.
In a year, Holi was enjoyed on 6th March 9 AM and Deepawali (Diwali) was celebrated on 11th November 8 PM. The total time interval (in hours) between the two was ?

82.
What was the day on 9th May, 2001?

83.
If 4th december 1999 is Monday then what day is 3rd january 2000 ?

84.
Which calendar was used again in the year 1856?