The date of Jude is uncertain. There are two theories on when the book was written. The first assumption is that 2 Peter used the book of Jude as a reference. This hypothesis would place the date of its writing around AD 65 before that of 2 Peter. There are many uncertain aspects of Jude.
Nothing is really for certain when it comes to the facts.
Another mystery is to whom the book was written to. It appears to be addressed to the Jewish Christians, the Gentile Christians, or possibly both. One theory that some scholars have, is that since 2 Peter 2 and Jude 4-18 talk about similar situations, then they were both written to the same people. This letter is a bitter, outspoken condemnation against false teachers. Although Jude was very anxious to write about salvation, he sensed an importance on warning his readers about corrupt people that had slipped into their company.