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Calendars (Calendar Zone)
Of all kinds and cultures and from all eras.

Time (Official US: Pacific Time Zone)
The Official US Time for all time zones is at The Official US Time.

Time & Frequency Division, NIST
The National Institute of Standards and Technology (NIST) page has a variety of services for verifying time and frequencies for computer clocks, radio stations, power companies, and more. This site includes a Glossary of Time and Frequency Terms.

Time and Time Zones
From About; a good annotated listing of links.

World Time Zones
From the U.S. Naval Observatory.

A Walk Through Time
This is an overview of the history of timekeeping maintained by the National Institute of Standards and Technology (NIST). Beginning with an explanation of various ancient calendar systems, the site then discusses early clock, modern time-keeping methods, and time zones.