Both 2 John and 3 John appear to have the same author and are believed to have been written in the first quarter of the second century CE.
These were two different Johns, attributed to two different books.
A:Like all the New Testament gospels, John's Gospel was written in Greek Koine.
Not sure what you are asking but John wrote the Gospel of John, 3 letters 1,2,3 John, and the Book of Revelation if this is what your looking for.
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It is thought that Revelation was written no later than the 90s of the first century, so it would be earlier than John's Gospel, which was written in the early second century. However, the author of Revelation, now known as John of Patmos, is regarded as a different person than the author of John.
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There are three letters written by John in the New Testament - 1, 2, and 3 John.
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Though 3 John 1 writes to Gaius, all three letters are for all of mankind to read.
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Schoalrs believe that 1 John was written soon after the Gospel of John, and therefore early in the second century. A minority opinion is that 1 John preceded John's Gospel, but this would still date it at the beginning of the second century. 2 John and 3 John appear to have been written somewhat later, by the same author as 1 John. Thus, Third John can be dated to around 120-150 CE.