In the New Testament there is a distinction 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).
You can see the references 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 John 2:18)
“He was foreknown before the foundation of the world but was made manifest in the last times for the sake of you. . . .” (1 Pet. 1:20)
“Now these things happened to them as an example, but they were written down for our instruction, on whom the end of the ages has come.” (1 Cor. 10:11)
that I will pour out my Spirit on all flesh,
and your sons and your daughters shall prophesy,
and your young men shall see visions,
and your old men shall dream dreams.” (Acts 2:17)
