网站简介：Time has been studied for thousands of years. Nevertheless, many issues remain to be resolved. This article explores both what is now known about time and what is controversial and unresolved.
网站简介：Information and history about Daylight Saving Time all over the world.
网站简介：Compare a Metric Clock (ten hours per day) with a Standard clock and find out what time it is.
网站简介：Concise description using drawings and animation to show the operation of a pendulum clock.
网站简介：A directory of sites providing descriptions of civil timekeeping concepts, source code, databases, and maps.
网站简介：Time is a common term for the experience of duration, and a fundamental quantity of measuring systems. Article explains time definitions, history of measurements, perceptions in religion, philosophy and science.
网站简介：A categorized collection of calendar related sites.
网站简介：Evolution of timekeeping through the centuries.
网站简介：Assistance for collectors, owners and enthusiasts of vintage wrist watches, identification and authentication of watches, catalog.
网站简介：Includes an ecclesiastical calendar and a section on old and new style dating.
网站简介：Website showing the restoration of a French flat bed tower clock in great detail, step by step, as well as other information and links of tower clock sites.
网站简介：Information about calendar history and calendar reform.
网站简介：An overview of the ISO 8601 notation for dates.
网站简介：History of the clock and how Americans have measured time and been affected by it.
网站简介：National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.
网站简介：The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
网站简介：Core algorithm of international time scale has multiple metrology applications, from atomic clock frequency characterization to definition of the meter. Equation, explanation and publications.
网站简介：A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.
网站简介：National news and programming organization
网站简介：Concise history, background, definitions and operational information regarding atomic clocks.
网站简介：Provides descriptions of several standards of time.
网站简介：Explains the importance of concept of time in the history of mathematics, science and measurement.nt.
网站简介：Frequently Asked Questions about time (from sci.astro news group)
网站简介：Explanation of the roles of components of a wristwatch.
网站简介：A short history of the week and each day of the week.