Here’s a map showing countries that use Daylight Savings Time
Blue means they do observe daylight savings time
Orange means they no longer observe it
Red means they never have observed it
As you can see, most of North America, almost all of Europe, much of Australia & NZ and more than half of South America have DST, amongst other places. Most of Africa and Asia don’t.
Remember though, that because Daylight Savings Time (or Summer Time) happens in the summer, the northern hemisphere has DST when the southern hemisphere doesn’t and vice versa.
I think it used to be pretty much lined up so that (Australia) end DST when the US start DST, but now they’ve changed it here, so we don’t end DST for a few more weeks (and I think the US might have changed it too so they start earlier too).