Go on Wikipedia, postie. There are two versions listed. The Elvis version is titled Have I Told You Lately That I Love You? and the Rod Stewart version is listed as a cover of the Van Morrison track Have I Told You Lately.
This is confusing. Arent there 2 different songs - the one written in the 1940s that Elvis and Gene Autrey and lots of others did and then the Van Morrison song which is the one a Rod did unless he also did the other one too