Calling Yaqub (alaihis salaam) Israeel

Q: I need a reference from the Ahaadeeth where people say Hazrat Yaqub (alaihis salaam) was Israeel, while Quraan mentioned his name, Yaqub 16 times, and also his progeny (2:132-133, 2:136, 2:140, 3:84, 4:163 etc.)

The reason for asking this question is that I got reference from the Book of Genesis, Chapter 32: 22-32, where Hazrat Yaqub (alaihis salaam) fought with Allah Ta'ala and overpowered Him. Then Allah Ta'ala blessed him. God said to him, "Your name is Jacob, but you will no longer be called Jacob; your name will be Israeel."

Calculating the age of an animal for qurbaani according to the Islamic date

Q: We slaughter goats for Qurbaani. We understand that a goat needs to be one year old. Must it be an Islamic year, or English?

The farmer gave us the date of the birth of this goat, and it was born on the same date as Eid (Islamic date), exactly a year ago. So it's exactly 1 year old, must we still check if it was born in the morning or afternoon, to make make sure we dont slaughter it before time?