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Here are some exhibits related to Time and Frequency...

clock icon A Walk Through Time
             An illustrated history of timekeeping from ancient to modern methods.
calendar icon Calendars Through the Ages
             A short overview of our current calendar, as well as other ethnic and historical calendars. (At webexhibits.org)

quartz watch The Quartz Watch
             Discover the fascinating stories behind the invention of the quartz watch. (At the Smithsonian Lemelson Center)

alarm clock Daylight Saving Time: Saving Time, Saving Energy
              Daylight saving time, its history and why we use it. (At webexhibits.org)