Online calendar with an extensive list of features.
A Walk Through Time
Follow the story of time and timekeeping, from ancient to modern times. From the NIST Physics Laboratory.
Information about Aztec rituals and their calendar versions or date telling systems.
Compare monthly calendars for the years between 1970 and 2030.
Convert Julian, Gregorian and Jewish dates, and calculate the serial day number for the date.
Designation of daylight savings time, when it begins and ends, and the history of this United States policy.
Time zones and time differences with distance calculator, US time zones and area codes plus air travel tools and calculations.
Explains why a leap year is needed and which years are leap years.
Light of Day
Discussion of the daylight saving time tackling affirmations and oppositions to it.
W3C Date and Time Formats
Defines a profile of ISO 8601, the International Standard for the representation of dates and times.