People could just DO EVERYTHING an hour earlier or later, depending on time of year. All sorts of businesses have summer/winter hours. And of course, these days, the whole concept of "business hours" means a lot less than it did even 20 years ago.
It's amazing, however, to see how clueless some people are about what STANDARD and DAYLIGHT time means. We constantly get communications from vendors in other time zones about meetings, connections, etc. at "11:00 CST", when both they and we are on DAYLIGHT time (i.e. there should be no "S").