Calendar Software

• Guide to calendar date conversion software
  Use this to find out which program (or pair of programs) will convert dates in a selection of calendars.

  

• Easy Date Converter
  Windows software for conversion among dates (in American, European or ISO 8601 format) in the following calendars:
  • Common Era (a.k.a. Gregorian) Calendar
  • Julian Calendar
  • ISO 8601 Week Calendar
  • Hermetic Leap Week Calendar
  • yyyy-ddd (day-in-year, ordinal) dates
  • Julian day numbers
  This program also gives you the day of the week for a date and does date arithmetic: adding or subtracting a number of days or months to or from a date, and getting the number of days between two dates (with inclusion or exclusion of weekend days). This is a bilingual program: English and German.

• Julian‑Gregorian‑Dee Date Calculator
  Converts between Julian, Gregorian, Dee and Dee‑Cecil calendar dates in various formats, does date arithmetic, and calculates vernal equinox dates.

• Lunar Calendars and Eclipse Finder
  Windows software for conversion among dates in following calendars:
  • Common Era (Gregorian) Calendar
  • Julian Calendar
  • Archetypes Calendar
  • Meyer-Palmen Solilunar Calendar
  • Liberalia Triday Calendar
  • Julian day numbers
  This program also finds the next or previous full moon, dark moon, half moon, lunar eclipse, solar eclipse, total solar eclipse, etc.

• Mayan Calendrics
  Console application software for conversion among dates in following calendars: Common Era (Gregorian) Calendan, Julian Calendar, Maya Long Count, Tzolkin-Haab and Julian day numbers. This program allows specification of correlation number, year-bearer system and month base number.

• Chinese Calendrics
  Software for converting between dates in the Chinese solar and lunar calendars and dates in the Common Era and Julian Calendars.
  

  This software also provides information such as the dates of Chinese New Year's Day for any year, and the presence of leap months in any selected 40-year period. It also allows you to find the next or previous full moon, dark moon, solstice or equinox, and allows addition of a certain period (e.g. a lunar month) or a certain number of days to a given date.

• Annus Novus Date Converter
  For converting between dates in the Annus Novus Decimal Calendar and dates in the Common Era Calendar.

• World Dual Petin-Meton Calendar Date Conversion Software
  For converting between dates in the Lunar Petin-Meton Calendar, the Solar Petin-Gregorian Calendar and the Common Era Calendar.

• Printable Calendar
  A modest utility to help you keep track of things to do, etc.

• Printable Hermetic Lunar Week Calendar
  The same for the Hermetic Lunar Week Calendar.

• Hermetic Lunar Week Calendar Day Count
  This gives information about the frequency of days of different kinds.

• The Hermetic Leap Week Calendar in Year-Month-Day Form
  Displays the months of the calendar for any year in the range 2007-2040.

• Online Chinese/Western Year Converter
  For converting between years in the Chinese Calendar and years in the Common Era Calendar. Short explanation given here.

Astronomical Year Numbering and the Common Era Calendar
Calendar Studies	Hermetic Software Home Page