by Hermetic Systems Adds or subtracts a number of days or months to a date, calculates the number of days between two dates, and converts among dates in various solar calendars: Gregorian, Julian, ISO 8601 Week, Hermetic Leap Week and day-in-year (yyyy-ddd).
by Hermetic Systems A program to search for eclipses (lunar, solar, total, annular and umbral), 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 five lunar calendars.
