Title: First Epistle of John
Content:  The First Epistle of John, often referred to as First John and written 1 John or I John, is the first of the Johannine epistles of the New Testament, and the fourth of the catholic epistles. There is no scholarly consensus as to the authorship of the Johannine works. The author of the First Epistle is termed John the Evangelist, who most scholars believe is not the same as John the Apostle. Most scholars believe the three Johannine epistles have the same author, but there is no consensus if this was also the author of the Gospel of John. This epistle was probably written in Ephesus between 95 and 110 AD. The author advises Christians on how to discern true teachers: by their ethics, their proclamation of Jesus in the flesh, and by their love. The original text was written in Koine Greek. The epistle is divided into five chapters.
Title: First Epistle of John
Content:  The epistle is traditionally held to have been composed by John the Evangelist, at Ephesus, when the writer was in advanced age. The epistle's content, language and conceptual style are very similar to the Gospel of John, 2 John, and 3 John. Thus, at the end of the 19th century scholar Ernest DeWitt Burton wrote that there could be "no reasonable doubt" that 1 John and the gospel were written by the same author. Beginning in the 20th century, however, critical scholars like Heinrich Julius Holtzmann and C. H. Dodd identified the Gospel of John and 1 John as works of different authors. Certain linguistic features of the two texts support this view. For instance, 1 John often 
Title: First Epistle of John
Content:  Around 415, Augustine of Hippo wrote a commentary in Latin On the Epistle of John to the Parthians (in Latin, ad Parthos), in which he identifies the addressees of John's letter as Parthians. It has occasionally been suggested that this refers to a community of converts in the Jewish community of Babylonia. Around 730, Bede wrote that Athanasius of Alexandria had also believed in a Parthian destination for 1 John. This tradition, however, is known only from Latin sources. (Three late Greek manuscripts of 2 John label it "to the Parthians".) On balance, it is likely that John's first letter was written for the Ephesian church and that the Parthian label results from a misreading or misunderstanding.
Title: Third Epistle of John
Content:  if the author was a personal disciple of Jesus. Marshall suggests a date of between the 60s and 90s. Rensberger suggests a dating of around 100, assuming that the Gospel of John was written in the 90s and the letters must have followed after. Brown argues for a date of between 100 and 110, with all three letters composed in close time proximity. A date past 110–115 is unlikely, as parts of 1 John and 2 John are quoted by Polycarp and Papias. The letters do not indicate the location of authorship, but since the earliest quotations of them (in the writings of Polycarp, Papias, and Irenaeus) come from the province of Asia Minor, it is likely that the epistles were also written in Asia. Church tradition typically places them in the city of Ephesus.
Title: Johannine epistles
Content:  The Johannine epistles, the Epistles of John, or the Letters of John are three of the catholic epistles of the New Testament, thought to have been written between 85 and 100 AD. Most scholars agree that all three letters are written by the same author, although there is debate on who that author is.
Title: First Epistle of John
Content: In Greek ; Codex Vaticanus (AD 300–325) ; Codex Sinaiticus (330–360) ; Codex Alexandrinus (400–440) ; Codex Ephraemi Rescriptus (c. 450; fragmentary) ; Papyrus 74 (7th century; fragmentary) ; In Latin ; León palimpsest (7th century; extant verses 1 John 1:5–5:21, including the text of the Comma Johanneum (1 John 5:7). The earliest written versions of the epistle have been lost; some of the earliest surviving manuscripts include: The Muratorian fragment, dated to AD 170, cites chapter 1, verses 1–3 within a discussion of the Gospel of John. Papyrus 9, dating from the 3rd century, has surviving parts of chapter 4, verses 11–12 and 14–17. Different versions of the Greek manuscript have different wording for some verses.
Title: Third Epistle of John
Content:  appearing in the middle of the third century. This lack of documentation, though likely due to the extreme brevity of the epistle, caused early church writers to doubt its authenticity until the early 5th century, when it was accepted into the canon along with the other two epistles of John. The language of 3 John echoes that of the Gospel of John, which is conventionally dated to around AD 90, so the epistle was likely written near the end of the first century. Others contest this view, such as the scholar John A. T. Robinson, who dates 3 John to c. AD 60–65. The location of writing is unknown, but tradition places it in Ephesus. The epistle is found in many of the oldest New Testament manuscripts, and its text is free of major discrepancies or textual variants.
Title: First Epistle of John
Content:  a demonstrative pronoun at the beginning of a sentence, then a particle or conjunction, followed by an explanation or definition of the demonstrative at the end of the sentence—a stylistic technique which is not used in the gospel. The author of the epistle also "uses the conditional sentence in a variety of rhetorical figures which are unknown to the gospel". This indicates, at the very least, the linguistic characteristics changed over time. Today, following the work of J. Louis Martyn and Raymond Brown, the majority of scholars believe that John and 1 John were written by different members of the same community: the "Johannine Community". Most critical scholars conclude that John the Apostle wrote none of these works.
Title: Epistle to the Ephesians
Content:  According to tradition, the Apostle Paul wrote the letter while he was in prison in Rome (around AD 62). This would be about the same time as the Epistle to the Colossians (which in many points it resembles) and the Epistle to Philemon. However, many critical scholars have questioned the authorship of the letter and suggest that it may have been written between AD 80 and 100.
Title: Third Epistle of John
Content:  All three letters of John were likely written within a few years of each other, and internal evidence indicates that they were written after the Gospel of John, placing them in the second half of the first century. This dating makes sense given their allusions and opposition to Gnostic and docetic teaching, which denied the full humanity of Jesus, and which was gaining ascendancy at the end of the first century. Dodd argues for a date between 96–110 A.D., concluding from the absence of references to persecution in the letters that they were probably written after the harsh reign (AD 81–96) of the Roman emperor Domitian, whose persecution of Christians seems to have prompted the writing of the Book of Revelation. Dodd notes, however, that they could have been written in the pre-Domitian era, which is 

Question: when was the first epistle of john written?
Answer: AD 95–110.
probably written in Ephesus.