According to Muslim's Faith, Devil was an Angel before, but when god made the very first human Adam and ask all the Angels to lie their heads down in front of him, all obidiently followed the order but that angel (Iblees) refused, that was the point when he was turned into Devil from Angel, that was the birth of Devil.
When viewing this from a Christian perspective, if the Devil, also known as Satan, actually exists, he was created sometime in the far distant past. This question is actually unanswerable because The Bible (or any other sacred book that I'm aware of) doesn't actually tell us the specific year when Satan was created.
Incidentally, certain Christians believe that Satan rebelled against God sometime in the past because of his growing ego and his desire to become the king of heaven. Accordingly, there was also a war in heaven, which was waged between Satan's armies and the archangel Michael's armies, which presumably took place in the past or will take place sometime in the future when the tribulation begins. And thus following the casualties of Satan's armies, Satan will be hurled to the earth to become the temporary king of this earth before the second coming of the Messiah, preceding Satan's final judgement. Some Christians disagree with this notion, however, and hypothesize other theories.
The Jersey Devil was born in 1735, by Mother Leeds somewhere in the Pine Barrens, NJ. That's what the legend says, anyway. I could also make a case for the Jersey Devil being born the first time someone realized it's fun to scare kids with a real campfire whopper story.
We don't know for sure but the bible says before humans.
The devil is Simon according to the scripture. It was a follower of Jesus, as for all religions need an good and a bad. He is the opposite of what Christians see in Jesus
The devil, or Satan, was not "born". He was one of God's created beings, and believed to be an angel.
In the Christian mythology the "history" is very vague when it comes to pre-Earth times.
While it does speak of Lucifer's rebellion it doesn't give any real details before that time period of the story. So what your asking is simply unanswerable as the creators of the mythology never gave him a date of birth.
Its also a unanswerable question by logic itself as well. If we are talking pre-Earth then our way of perceiving time would not exist yet nor would any dates. The only answer that could be truthfully given would be before us.
Devil's Answer was created in 1998.
The Devil in Me was created in 1977.
Outwitting the Devil was created in 1938.
My Devil in Your Eyes was created in 2010.
When the Devil Dances was created in 2002.
The Little Devil was created on 1988-10-14.
Dancing with the Devil was created in 1999.
Devil's Meat was created in 1994.
Dirt Devil was created in 1905.
The Devil's Nightmare was created in 1971.
Mowing-Devil was created in 1678.
Devil's Bride was created in 1974.