by Hermetic Systems Adds a number of days 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 Weak and day-in-year (yyyy-ddd).
by Hermetic Systems A program to convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and to find lunar new year's day and leap months for any year in the Chinese Calendar.
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 four lunar calendars.
by M-Azlan Software Add, minus, divide and multiply time values in hours, minutes and seconds. Convert from fractional values and vice-versa. Use the DAE (date analysis engine) to find the day of any date in the Gregorian calendar within a range of up to 15 centuries.
