Dhanteras or Dhan Trayodasi, also spelt as Dhan Teras, is the most auspicious and prosperous occasion during the four-day festival – Diwali. Dhanteras is celebrated on Aswayuja Krishna Triodasi. Hence it is also called as Dhana Trayodashi. In 2012, Dhanteras date is November 11.
It is believed that purchasing any new things such as home appliances or jewelry is very prosperous on this day. On this day, lighting of diyas is the ritual and custom. On Dhanteras, Dhanwantari Jayanthi is also celebrated.