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There are three ENTER buttons for three sets of input fields.

1. Date input:   Enter a date and time. Then click 'Calculate JD' to see the corresponding Julian Day Number.

2. Julian Day Input::   Enter a Julian Day Number. Then click 'Calculate Date' button to see the associated Date. Options include the 'Standard' method of dating which uses Gregorian Dates after 1582 and uses the Julian Calendar System (not to be confused with Julian Day Number) before 1582. Other choices include displaying the Gregorian or Julian Calendar system for all dates throughout history.

3. Adding and Subtraction:   Time can be added or subtracted using the third input field. Enter a whole or decimal number of days to be added or subtracted then click the '+/-' button. Subtraction is accomplished by placing a '-' symbol ahead of the number of days to be subtracted.