New American Standard Bible (©1995)
And the four angels, who had been prepared for the hour and day and month and year, were released, so that they would kill a third of mankind.
King James Bible
And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.
Darby Bible Translation
And the four angels were loosed, who are prepared for the hour and day and month and year, that they might slay the third part of men;
English Revised Version
And the four angels were loosed, which had been prepared for the hour and day and month and year, that they should kill the third part of men.
Online Parallel Bible