That's not how this works. DST has only come about since early 1900s, and currently, most of the world doesn't observe Daylight Savings, especially those who are close to either pole or closer to the equator, where it's either hot as hell or freezingly cold. Places where seasons aren't as 'normal', essentially. Essentially, the primary point of Daylight Savings existing is more sunlight during the summer. We put the clocks forward an hour to make our early mornings dark, but also our nights lighter. Without Daylight Savings being observed, this is still kinda the case, due to the Earth being on its axis, spinning around the sun. The Solstices, or the longest/shortest days. They are called this due to them being the days where there is the most/least amount of sunlight. What I believe you are referring to is the leap days, where the earth year is not exactly 365 days. It was proposed to add a day every four years to stop the seasons being out of sync after a number of years. But of course it's not that simple, this is actually slightly too much. This would cause a day out of sync per hundred years. Then it suggested to not have a leap year when it's a new century (1600, 1700, etc). Slightly too few still, so if the century year is divisible by 400, then it will be. This finally causes the sync error to be 1 day per 8000 years.
