Answers to frequently asked questions about calendars, including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
Daylight Saving Time
History of Daylight Saving Time, U.S. law and practice, and worldwide time change dates.
Official U.S. Time
Provided by the National Institute of Standards and Technology (NIST) and the U.S. Naval Observatory.
time and date.com
Shows current local times around the world. Also, creates customizable calendars that include moon phases and holidays.
Last updated: April 27, 2010