- Calendopaedia: The Julian Calendar
 - History and background on the Julian Calendar, the calendar introduced by Julius Caesar to replace the old Roman calendar. - Julian Calendar
- Brief summary of the Julian calendar, imposed by Julius Caesar in 46 B.C. to replace the original 10-month Roman calendar.
- Julian Date Converter
- Online tool that converts between standard U.S. calendar dates and times to Julian dates and times. From the U.S. Naval Observatory.
- Synoptical Julian-Gregorian Calendar
- Compare the Julian and Gregorian calendars for any date between 1582 and 2100 using this side-by-side reference.
- The Perpetual Calendar
- Article about the process of switching from the Julian to the Gregorian calendar, with a table showing when each nation made the transition.
- What is the Julian Calendar?
- Explains the workings of the Julian Calendar, used by the Roman Empire after 46 B.C. and by the Catholic Church until the 16th century.
- Wikipedia: Julian Calendar
- Hyperlinked article about the calendar that was introduced by Julius Caesar in 46 B.C.E.
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