ISDATE is a tiny program (just 3KB) designed to be run in MSDOS and whose aim is to compare a file with two different dates.
With ISDATE you just indicate the file to be compared, and the date intervals to see if it has suffered any change, for example: IsDate C:\arc\foo.txt before today-7. The result will be True/False.
The comparison operations that can be used are equal, before or after. The date intervals that ISDATE works with are from 1st January 1901 to the year 2079.