Daylight saving time could take effect for the last time on Sunday. Amid the federal government debating whether to keep daylight saving time or toss it for good, the clocks are leaping forward an hour yet again.

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.