Date and Time
- Learn About Calendars from Various Cultures - "From the beginning of organized civilization, humans have always had a need to organize and document time as well as plan for future dates. Calendars, by their very nature, allowed people to plan and order events as well as a way to communicate about the events relative to one another. Calendars originally primarily revolved around agriculture or religious occurrences, and many ancient calendars were based on the phases of the moon or other natural phenomenon."
- Perpetual Calendar - Enter month and year for display of calendar month. With a daily almanac, including a word for the day.
- Timeanddate.com - site has the current time and date for 512 cities, worldwide, and Greenwich Mean Time. World times can also be displayed for each continent, or sorted by country or by time zone. An annual or monthly calendar (1 to 3999 A.D.) can be displayed, showing the phases of the moon, and holidays for select countries. Also display the number of days, hours, minutes and seconds that exist between 2 dates.