Feeds

Hold on a sec - leap seconds granted a last-minute reprieve

Boffins delay decision on using sunrises or atomic clocks to set the time

SANS - Survey on application security programs

A decision to kill leap seconds and permanently change how time is measured has been deferred until 2015 by the International Telecommunication Union.

A meeting of ITU Radiocommunication Assembly reps on Thursday was unable to reach a decision on whether to stop adding leap seconds to Coordinated Universal Time (UTC) to keep it in check with our world's uneven rotation.

The ITU will now spend the next three years conducting further studies "to ensure that all the technical options have been fully addressed" and to hold further discussions with members.

The US, Canada, Japan, Italy, Mexico and France are reported to have supported the alteration, but the UK and Germany opposed. Other member states wanted further probing.

In a statement, the ITU said its Secretary-General, Hamadoun Touré, considered the move to postpone the decision would "ensure that all stakeholders have been adequately associated with a step which will clearly influence our future".

Leap seconds were introduced in 1971 to keep UTC accurate: UTC is measured using the rotation of the Earth and super-accurate International Atomic Time (TAI).

The problem is that the Earth's spin is not constant - it's slowing down - while TAI is a constant. Leap seconds are added every so often to keep the gap between the atomic clocks and the time according to the planet's rotation at less than 0.9 seconds.

Supporters of the change argue leap seconds are unworkable in the long-term and are an unnecessary and potentially dangerous addition for systems relying on precise time measurements, for example, to pin-point their location. Their opponents claim there's a lack of credible evidence to suggest that serious problems are caused by leap seconds and further counter that computers can easily cope with delaying time for a brief moment.

Decoupling UTC from the rotation of the Earth would bring to an end a millennia of telling time using the spin of the Earth as it orbits the Sun.

The ITU's leadership appears to favour the change as it would eliminate need for what it called "specialized ad-hoc time systems". It added, however: "[This] may have social and legal consequences when the accumulated difference between UT1 - Earth rotation time - would reach a perceivable level - two to three minutes in 2100 and about 30 minutes in 2700." ®

Top three mobile application threats

More from The Register

next story
Red-faced LOHAN team 'fesses up in blown SPEARS fuse fiasco
Standing in the corner, big pointy 'D' hats
KILLER SPONGES menacing California coastline
Surfers are safe, crustaceans less so
LOHAN's Punch and Judy show relaunches Thursday
Weather looking good for second pop at test flights
Discovery time for 200m WONDER MATERIALS shaved from 4 MILLENNIA... to 4 years
Alloy, Alloy: Boffins in speed-classification breakthrough
Curiosity finds not-very-Australian-shaped rock on Mars
File under 'messianic pastries' and move on, people
Elon Musk's LEAKY THRUSTER gas stalls Space Station supply run
Helium seeps from Falcon 9 first stage, delays new legs for NASA robonaut
Top Secret US payload launched into space successfully
Clandestine NRO spacecraft sets off on its unknown mission
New FEMTO-MOON sighted BIRTHING from Saturn's RING
Icy 'Peggy' looks to be leaving the outer rings
prev story

Whitepapers

Designing a defence for mobile apps
In this whitepaper learn the various considerations for defending mobile applications; from the mobile application architecture itself to the myriad testing technologies needed to properly assess mobile applications risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.