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About Date Calculator
The Date Calculator application is a shareware application for many date and time calculations and
conversions. The Date Calculator is a MacOS X only application written using Apple's new development tools (the "Cocoa" environment). It has the following capabilities and more:
- You can enter dates a wide variety of ways and convert the dates between four different calendars. The Date Calculator supports the Gregorian, Julian, Hebrew, and French Republic calendars.
- You can customize the format for display of dates. By default, dates are formatted as in GEDCOM genealogy files.
- You can calculate the day of the week for any precise date.
- You can enter two dates and calculate the time span between those two dates. Time spans can be displayed as days, years and days, months and days, or years, months and days.
- You can enter any time span and add or subtract it to or from the date.
- You can add or subtract time spans.
- Most date applications expect you to enter precise dates with a day, a month,
and a year before they will do conversions or calculations. All features
of the Date Calculator can be done on "fuzzy" dates.
"Fuzzy" dates are dates with just a month and year or just a year.
- When time spans are calculated
between fuzzy dates, the Date Calculator will calculate the maximum and
minimum times that could possibly span the information given in the "fuzzy
dates" and give the results as a time range.
- When times or time ranges are added or subtracted to or from fuzzy dates, the
Date Calculator will calculate the range of dates that could possibly
differ from the original date by the entered time span.
- Fuzzy date calculations are often useful to genealogists. For example,
if you know someone was born in 1824 and died in NOV 1901, how old were they
at death? Using the Date Calculator, you can calculate that the time
span between these two dates is "BET 76y, 10m, 2d AND 77y, 10m, 30d".
Thus, they were 76 or 77 years old with a greater chance of being 77.
- Adding or subtracting time spans to or from fuzzy dates can also be useful.
For example, if you know someone died in NOV 1901 at age 77, when where they
born? Using the Date Calculator, you can subtract "BET 77y AND
77y, 364d" from "NOV 1901" and find the possible birth dates
as "BET 3 NOV 1823 AND 30 NOV 1824". If you later find out they were
born in 1824, then the birth date is narrowed down to NOV 1824 or DEC 1824.
- Many keys (or buttons) are available to help in entry of dates and date ranges.
- Nine memory locations can be used for storing and recalling previous date or time entries.
- Extensive help information with details about each of the four supported calendars is included.
Screen Shot
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Click image on the left to see a screen shot in a separate window.
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Click image for screen shot |
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Additional Information
Date Calculator uses the date conversion utilities written by
Scott E. Lee. He has written a Date Convertor Web Site that converts precise dates between Gregorian, Julian, and Hebrew calendars. He has also posted an excellent Calendar Overview about those calendars. Most of his overview is included (with permission) in the Date Calculator on-line help.
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| Purchasing |
 You can purchase a license using convenient online ordering. Now also accepting PayPal orders. |
| GEDitCOM |
 The Date Calculator interfaces with the Macintosh genealogy application GEDitCOM for easy date and time calculations. |
| AppleScript |
 The Date Calculator is a scriptable application for adding date and time calculation to your Apple scripts. |
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