Back in the halcyon days of RPG II/III, calculating differences between two dates or times was enormously complex and took tons of code (does anyone else remember Paul Conte's multi-part "Ultimate Date Routines" series in NEWS/400 magazine?). Well, that was then and this is now.
.NET offers superb date calculation capabilities. Let's take a brief look at how to use them. Let's say you wanted to know how long it's been since the Beatles' US debut on Ed Sullivan's stage on February 9th, 1964 and the last time they played together live on that blustery rooftop in London (with the late, great Billy Preston on the organ) on January 30th, 1969.