Except that people's hours are not based on solar noon, they are based on whatever the country has arbitrarily chosen. If you look at a daylight map, you can be misled by multiple hours. Or if we're near a solstice and they're far from the equator, there will be gross inaccuracies. So you still need a translation into "local time". That means either doing math in your head, or having the computer reply "four hours and 35 minutes until start of business". Both of those are more awkward than taking "4:25" and classifying it in your head the same way you classify your own times.