Originally, leap seconds were added to provide a UTC time signal that could be used for navigation at sea. This motivation has become obsolete with the development of GPS (Global Positioning System) and other satellite navigation systems. These days, a leap second is inserted in UTC to keep it within 0.9 seconds of UT1.
Normally, the clock would move from 23:59:59 to 00:00:00 the next day. Instead, at 23:59:59 on June 30, UTC will move to 23:59:60, and then to 00:00:00 on July 1. In practice, this means that clocks in many systems will be turned off for one second.
Don't forget to put your clocks back on June 30th.
Moderators: Aladinsaneuk, MartDude, D-Rider, Moderators
- Samray
- Double World Champion
- Posts: 6234
- Joined: Thu Dec 14, 2006 6:36 pm
- Location: Riding round with Sheene and Simoncelli
Don't forget to put your clocks back on June 30th.
In spite of the cost of living, it's still popular.
- kneescratch
- Track Day Addict
- Posts: 181
- Joined: Fri Sep 21, 2007 9:24 pm
- Location: Shoeburyness
Re: Don't forget to put your clocks back on June 30th.
I stayed up for that, every second counts y'noSamray wrote:Originally, leap seconds were added to provide a UTC time signal that could be used for navigation at sea. This motivation has become obsolete with the development of GPS (Global Positioning System) and other satellite navigation systems. These days, a leap second is inserted in UTC to keep it within 0.9 seconds of UT1.
Normally, the clock would move from 23:59:59 to 00:00:00 the next day. Instead, at 23:59:59 on June 30, UTC will move to 23:59:60, and then to 00:00:00 on July 1. In practice, this means that clocks in many systems will be turned off for one second.

- snapdragon
- SuperBike Racer
- Posts: 866
- Joined: Sun Dec 17, 2006 9:01 pm