An hour earlier and the daylight they receive is different all over the planet depending on the time of the year.
You really should stop and think about what I am trying to tell you. This is not too difficult to understand. Think about time zones even, the people on the boarder at some places have very different times the sun is up. Look at a daylight map of the latitude and year times.
But most importantly: I went and looked at the paper and the intent: Their argument is that we should quit changing. They just picked one. It could be the other one, it makes no difference, they just want it to stop changing. As any rational human should.