A unique feature of the Date Calculator versus other date utilities is that you can enter "fuzzy" dates, like just a month and year (APR 1901) or a range of dates (FROM 1845 to 1867), an still do 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 for genealogists working with imprecise date information.
Note: Now requires OS X 10.9 or later running on a 64-bit Intel processor
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