Add Yahoo as a preferred source to see more of our stories on Google. A command post tracks local and Zulu time to sync units across theaters.(U.S. Air Force/David Bedard) If you've ever heard someone ...

Researchers led by Gen Kurosawa at the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) in Japan have used theoretical physics to discover how our biological clock ...

If you’re guilty of accidentally setting your alarm on your smartphone for 6 p.m. instead of 6 a.m. — you’re not alone. Most Americans prefer the a.m.-p.m. system instead of the 24-hour clock. But why ...

If you’ve ever heard someone say a meeting is at 1630 and then felt your brain do a small cartwheel, you have met the 24-hour clock. In the United States, we mostly live by the 12-hour clock, with a.m ...