Diwali, the festival of lights, is a special occasion which is celebrated with great pomp and merriment all over India. The festival signifies the victory of good over evil. The festivity period of Diwali begins with the arrival of Dhanteras and ends on the day of Bhai Dooj. As Diwali marks the beginning of the commercial year, the festival holds special importance.
Here's a calendar which will keep you informed regarding the holidays. According to the Gregorian Calendar, this year in 2018, Diwali will fall on November 7, Wednesday.
P. S – The dates are subjected to change as per the lunar activity.