Daylight saving time is ending Sunday. Here's what to know as clocks 'fall back.'

It’s time to fall back again.

The clock will strike 1 a.m. twice Sunday as daylight saving time once again comes to an end.

Here’s what you need to know about daylight saving time and why the United States changes clocks twice a year.

When does daylight saving time end?

Daylight saving time started March 9 and ends Sunday.

Unlike in the spring, when we lose an hour and the clocks skip the 2 o’clock hour entirely, we will gain an extra hour Sunday, with clocks jumping from 1:59 a.m. back to 1 a.m.

The sun will also start setting earlier across the United States as we head into the late fall and winter.

How long does standard time last?

Standard time across the United States will remain, as will earlier sunsets and darker evenings , until spring rolls around and daylight saving t