When Does "The World of Krypton" #4 (1987) Take Place?
"The World of Krypton" #4 v2 “Family History” is a science fiction comic-book written by John Byrne and released November 10th, 1987.
We know this because it depicts little Kal-El being sent to Earth as a baby and "Man of Steel" #1 v1 (1986) and “The World of Smallville” #2 (1988) establish this year as 1954 AD on the Gregorian calendar.
It takes place on an alternate timeline of the fictional DC Comics Universe in the year:
1954 AD
We know this because it depicts little Kal-El being sent to Earth as a baby and "Man of Steel" #1 v1 (1986) and “The World of Smallville” #2 (1988) establish this year as 1954 AD on the Gregorian calendar.
Additionally, this issue reveals that the previous three issues with their multiple frames have been inside yet another frame: the first year after Kal-El/Clark Kent/Superman has begun his career as the first superhero on Earth. The year is not stated other than the strong implication it is ‘the present’.
This comic-book was retroactively collected into a "Superman: The World of Krypton" paperback and then collected again into a later, expanded "Superman: The Many Worlds of Krypton" paperback.
It is a chronologically midway comic in the DC Comics Universe multiverse timeline (a chronological fourth comic to feature Kryptonians) and can be read after the previous issue, "The World of Krypton" #3 v2 (1987) and before "Man of Steel" #1 v1 (1986).