Your Choice on Which Day to Slaughter

1. Qurbaani is valid till the 12^th of Zul Hijjah just before the sun sets.
2. Once the sun sets on the 12^th of Zul Hijjah the time of Qurbaani is over.
3. You can slaughter on any day from the 10^th of Zil Hijjah till the 12^th, on whichever day you wish.
4. You can slaughter during the day or even during the night.
5. However, it is not preferable to slaughter at night as it may result in one of the veins not being cut due to the darkness and thus invalidating the Qurbaani.

(Behshti Zewar)