Amavasya is the no moon day in a month in a traditional Hindu lunar calendar. In November 2012, Amavasya date is November 13. Time – Amavas begins at 6:13 AM on November 13, 2012 and ends at 4:01 AM on November 14, 2011. The Amavasya Vrat, Snan, dhan, Shradh and Tarpan are performed on November 13. November 13, 2012 is observed as Diwali.
As per traditional North Indian calendar the November 13 Amavasya is of the Kartik month. In other regions it is the Ashwin Amavasya.
In Tamil Calendars it is the Aippassi Amavasya.
Amavasya is the darkest day in a traditional Hindu month and is considered both auspicious and inauspicious by different Hindu communities.
There are many Hindus who undertake a fast on Amavasi. Some devotees only take a single meal on the day.
Ashwin month ends in traditional calendars followed in Maharashtra,
Gujarat, Andhra Pradesh and
Karnataka on November 13.
In Gujarati Calendars, November 13 marks the end of Vikram Samvant 2068. Gujarati New Year is observed the next day.