Note 20 at 1Co 15:52: The Greek word that was used here for "moment" was "ATOMOS." It literally means "that which cannot be cut or divided, hence 'atom'" (The Companion Bible). Paul was saying that this change of our bodies from corruptible to incorruptible and from mortal to immortal will take place instantly. Praise the Lord!

Note 21 at 1Co 15:52: Notice Paul's emphasis on the word "last." If this statement is to be taken literally (and there is no apparent reason to take it any other way), then this change of our mortal bodies that Paul referred to will happen at the precise time John recorded in Re 11:15-19 (see Re 8:2 and 10:5-7).