Mac App Store

Mac App Store is the simplest way to find and download apps for your Mac.

To download Date Calculator from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.

Date Calculator

By RSAC Software

Open the Mac App Store to buy and download apps.


The Date Calculator is a date utility for genealogists. You can enter any date and convert it between Gregorian, Julian, Hebrew, and French Republic calendars and find its day of the week. You can enter two dates and find the time span between them. You can do various other date and time calculations and conversions such as adding time to a date, subtracting time from a date, or adding and subtracting times.

A unique feature of the Date Calculator versus other date utilities is that you can enter fuzzy dates, such as just a month and year (APR 1901), just a year (1864), or a range of dates (FROM 1845 to 1867), and still do useful calculations. The calculations will give all possible answers for the date and time information provided. Being able to do calculations with imprecise dates and time spans is a very useful tool in genealogy research.


Screenshot 1

Customer Reviews

Date Calculator

Appears to work for what it does. Would be nice if there were even some basic documentation describing each of the functions in the bottom two rows. There is nothing on the website and little help in the program. Will up my rating when complete documentation is available.

Date Calculator
View in Mac App Store
  • $9.99
  • Category: Utilities
  • Released:
  • Version: 2.0
  • Size: 0.7 MB
  • Language: English
  • Seller:

Compatibility: OS X 10.6.6 or later

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.