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Celtic Festivals and Cross Quarter Days 9.44
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US$29.95, €26.45 or £23.95 

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A program to find the exact dates and times, and zodiac positions, of full moons and dark moons, lunar Celtic festivals (Imbolc, Beltane, Lughnasadh and Samhain), equinoxes and solstices, and solar cross-quarter days. Moreover, it can do this for any range of years between 1600 and 2099.
 
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Chinese Calendrics 16.16
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US$49.95, €44.25 or £39.95 

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A program to convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and to find (among other things) lunar new year's day and leap months for any year in the Chinese Calendar.
 
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Date‑Time Calculator 5.24
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US$19.95, €17.75 or £15.95 

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Software to perform conversion, addition and subtraction of dates and times.
 
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Easy Date Converter 12.26
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US$19.95, €17.75 or £15.95 

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Adds a number of days or months to a date, calculates the number of days between two dates (with or without weekend days), and converts among Common Era (Gregorian) dates, Julian dates, ISO 8601 Week dates, Hermetic Leap Week dates, Julian day numbers and day-in-year dates of the form yyyy-ddd. Bilingual: English and German
 
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Eclipses, Moon Phases and Seasons 8.14
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US$29.95, €26.45 or £23.95 

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Displays (over a range of years) the exact dates and times of partial, annular and total solar eclipses, of partial, penumbral and total lunar eclipses, of phases of the Moon, and of solstices, equinoxes and the solar cross-quarter days.
 
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Equinoxes, Solstices and Cross‑Quarter Days 6.17
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US$14.95, €13.25 or £11.95 

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Software to calculate accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days. The cross-quarter days are those midway between the equinoxes and solstices. Works for both the northern hemisphere and the southern.
 
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Julian‑Gregorian‑Dee Date Calculator 7.46
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US$14.95, €13.25 or £11.95 

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Converts between Julian, Gregorian, Dee and Dee-Cecil calendar dates in various formats, adds/subtracts a number of days, weeks, months and years to/from a given date, and calculates northern spring equinoxes using either mean or apparent solar time.
 
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Lunar Calendars and Eclipse Finder 16.36
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US$19.95, €17.75 or £15.95 

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A program to search for eclipses (lunar, solar, total, annular and partial), to calculate the phase of the Moon at any given date and time and to convert between dates in the Gregorian and Julian calendars and dates in various lunar calendars: Meyer-Palmen Solilunar, Hermetic Lunar Week, etc.
 
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These programs run under all versions of Windows from Windows 98 to Windows 10. The software can be made fully-functional by means of an activation key sent by email after purchase of a user license. Updates to new versions (if any) are free, as is tech support for the duration of the user license.

The developer of these programs (Peter Meyer) is currently available for custom software development at an affordable rate.  If interested please leave a message here.
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