Upakarma is an ancient annual Vedic ritual followed by Brahmins in Shravan month or Bhadrapad month (August – September) depending on the Veda they follow or read. Changing of Yagnopaveetha is the main ritual followed on Upaakarma day. Here are the dates of Upakarma 2012:
- Krishna Yajurveda Upakarma 2012: 2 August. Some calendars of Tamil Nadu mentioned Yajur Upakarma date as 1 August.
- Rig Veda Upakarma 2012: 2 August
- Shukla Yajurvedi Upakarma or Yajur Upakarma 2012: 2 August (Hayagriva Jayanti) / (Avani Avittam) / Jandhyala Purnima. Some calendars of Tamil Nadu mentioned Yajur Upakarma date as 1 August.
- Sama Veda Upakarma or Sama Upakarma 2012: August 18. As per Vaakya Panchangam, Samaveda Upakarma date is July 24, 2012.
Upakarma means the ‘beginning’ in Sanskrit as it is the most auspicious day to start Vedic studies.
Rig Upakarma and Yajur Upakarma are observed in Shravan month whereas Sama Upakarma is observed in Bhadrapad month. Shravan Purnima is also observed as Hayagriva Jayanthi. To honor Lord Hayagriva, the protector of Chatur Vedas, Brahmins observe Upaakarma on Shravani Purnima day.

venugopala iyengar
Aug 18. 2010
Where are the detailed Manthras &rishi tharpanam for yajur upakarma?
Sanchit
Apr 24. 2013
tharpanam sankalpam on 25/4/2013 lunar eclipse