We all know that time is important. We want to be on time, know what time lunch is and watch a TV show at a certain time.
Do you know the history of time? The US Department of Commerce, National Institute of Standards and Technology and US Naval Observatory provide an online resource at http://www.time.gov/.
You can check the exact time in multiple US time zones and view interesting exhibits about the history of timekeeping, calendars through the ages, how watches work and how time relates to US history.