While all but two states in the U.S. continue to observe daylight saving time, there is still disagreement about whether it should be eliminated or made permanent.

After a long winter of short days, it’s finally time to spring forward. Clocks across the U.S. will jump from 1:59 a.m. to 3 a.m. Sunday. Here’s what you need to know about daylight saving time and why we change the clocks twice a year in the U.