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Reference

Time Service Department, U.S. Naval Observatory 
This site tells the official U.S. time of day in 24-hour time.

Calendar Zone 
"Links to all sorts of calendar sites on the Internet. Find unusual calendars such as celestial, cultural, and historic, as well as traditional calendars."

CalendarHome 
"Lots of links to calendar sites, plus a utility that allows you to view a month or year calendar for any year 1 to 10000 A.D. All leap years and calendar changes are accounted for."

Calendars Through the Ages 
"In addition to the general history this site provides there is also information about calendars currently in use (Chinese, Christian,Hebrew, Indian, Islamic, etc. and those no longer used (Babylonian, Egyptian, Mayan,etc.) "

How Time Works 
"Explanations from HowStuffWorks of things such as clocks, time zones A.D. and B.C. and moreà"

Local Times Around the World
"This guide attempts to list all of the world's countries, and many of its islands, with a pointer to the local time in the region."

Official US Time 
Find the exact time for your U.S. time zone. Information comes from the National Institute of Standards and Technology and the U. S. Naval Observatory.

Perpetual Calendar 
Obtain a calendar for any month from 0001 to 9999.

Time and Date 
Find out what time and day it is anywhere in the world.