Justin Taylor: The New Testament distinguishes between “the last day” (that is, the coming day of salvation and wrath; see 1 Thess. 5:1-11) and the “last days” (the period of time we are now in, between Christ’s death/resurrection/ascension and his second appearing). In addition to “last days,” this present-day category can also be called “the last time/s” (Jude 1:18; 1 Pet. 1:20) or “the last hour” (1 John 2:18). So when asked if you think we are living in the last days, you can assure the questioner that we are: we are living in between the two comings of Christ. But we do not know—indeed, cannot know—the day or the hour of the last day itself (cf. Matt. 24:36). You can see the references for last days/times/hour below: “Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour.” (1
read more How We Know for Certain That We Are Currently Living in “The Last Days”