# When was the last leap second added?

## When was the last leap second added?

December 31, 2016
The last leap second was December 31, 2016. Since they always add leap seconds on the last day of June or December, the next possible date for a leap second is June 30, 2022. Timekeepers have added leap seconds 27 times since 1972. There were leap seconds added on June 30, 2015, and on June 30, 2012.

Why was a leap second added on June 30 2015?

The day will officially be a bit longer than usual on Tuesday, June 30, 2015, because an extra second, or “leap” second, will be added. “Earth’s rotation is gradually slowing down a bit, so leap seconds are a way to account for that,” said Daniel MacMillan of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

### Does 2020 have a leap second?

Between 1972 and 2020, a leap second has been inserted about every 21 months, on average….Insertion of leap seconds.

Year Jun 30 Dec 31
2020 0 0
2021 0 0
2022 0
Year Jun 30 Dec 31

What is leap second problems?

Leap seconds are a periodic one-second adjustment of Coordinated Universal Time(UTC) in order to keep a system’s time of day close to the mean solar time. However, the Earth’s rotation speed varies in response to climatic and geological events, and due to this, UTC leap seconds are irregularly spaced and unpredictable.

#### How much is a second in space?

It is defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 metres (983,571,056 ft).

Can a minute have 61 seconds?

July will arrive a little late this year – one second late, to be exact. Time will stand still for one second this evening (June 30) as a “leap second” is added to Coordinated Universal Time (UTC), the time standard by which most clocks are regulated.

## Do we lose time every year?

Each year seems to go faster and faster, but astronomers have revealed that Earth’s day has actually been getting longer. The team found that thanks to the gradual slowing of our planet’s rotation, a day on Earth lengthens by around 1.8 milliseconds every 100 years.

Why are there leap seconds?

Why Do We Need Leap Seconds? We add leap seconds from time to time to ensure our clocks reflect the Earth’s rotation speed as accurately as possible. The speed at which our planet rotates around its axis fluctuates daily, and it slows down very slightly over time.

### When is the next leap second?

The next possible date is December 31, 2022. However, the Earth’s rotation has been relatively fast lately, so it is unlikely that any leap seconds will be added in the near future. In any case, we will publish the date of the next leap second here as soon as it has been officially announced. Why Do We Need Leap Seconds?

Should leap seconds be replaced by leap hours?

In 2005, US scientists proposed to eliminate leap seconds and replace them with leap hours. The proposal was criticized for its lack of consistent public information and adequate justification.

#### What is a leap second on a clock?

The average speed of Earth’s rotation is measured by Universal Time (UT1). When the difference between UTC and UT1 is predicted to reach 0.9 seconds within 12 months, a leap second is added to UTC and clocks worldwide. In other words, our clocks are always kept within a second of the average length of a day.