Dwipuṣkar Yoga forms from a specific weekday, tithi and nakshatra together, and is said to double (dwi = two) whatever is acquired or lost on that day — so it favours auspicious gains and purchases. Upcoming dates for the next year, computed for Chennai.
About this yoga
The doubling works both ways in tradition: acquisitions multiply, but so can losses — so Dwipuṣkar is used for buying and auspicious starts, and avoided for anything one would not want repeated.
Dates are for Chennai; a yoga can begin or end at a different clock time in your city. For a major event, confirm with a full muhūrta.