Date Calculator 4+

RSAC Software

    • 3.0 • 2 Ratings
    • $9.99



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.

What’s New

Version 3.1

Updated and tested in MacOS Sonoma including internal code changes to use latest MacOS methods.

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

corky37 ,

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.

Developer Response ,

See the help menu command "Date Calculator Help." A window opens with extensive documentation on all features. Please have a look at the documentation. I sometimes get complaints I provide too much documentation, but never that it is too little.

App Privacy

The developer, RSAC Software, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.