diwali

Dates in various calendars
The festival is celebrated for a differing number of days by different communities. In Maharashtra and Karnataka, the celebrations start from Vasubaras, 12th day of the second fortnight of Ashvin (going on for 6 days) while in Northern India the celebrations start from Laxmi Puja the no moon day of the same month (going on for 2-3 days). Though the core days are common and fall on exactly the same set of days across India, they fall in different months depending on the version of the Hindu calendar being used in the given region.
The Amanta ("ending on the no-moon") version of the Hindu Calendar has been adopted as the Indian national calendar. According to this calendar, which is prevalent in southern India and Maharashtra, the 6-day celebration is spread over the last four days of the month of Ashwayuja (Ashwin in Marathi) and the first two days of the new month of Kartika. According to the Purnimanta ("ending on the full-moon") version prevalent in northern India, it falls in the middle of the month of Ashwayuja/Ashvin. In the Gregorian calendar, it falls generally in the months of October or November. In 2006, it was celebrated on [October 21], (Saturday).