Seattle got cold today. I don’t know why the temperature always seems to drop about 10 degrees the same weekend we turn back the clocks. Perhaps the temperature will drop one week later next year? 
Slate’s Tim Harford speculates that the US would be better off with one national time zone.
China stays all on one timezone — people in the western provinces tend to use their own local time, which can confused a lot of things. Personally, I don’t think it’s worth it.