The last eyewitness account is John. The earliest fragment of it is p52. It is dated to around 118A.D. and found in Egypt. This means John’s account had to be circul-ated enough by that time to get to Egypt and then be copied all by that time, which pushes the orig-inal’s date into the first century.
The earliest written eyewitness account of the resurrection is actually not in the gospels. The earliest account is found in 1 Cor 15:1-11. 1 Corinthians was