Acute Software s Date Calculator descriptions Calculates the number of days/weeks/months or years between any 2 dates from 1900 - 2999 in a simple point & click display. You can also offset the start and/or end dates by any amount. Very handy for seeing how old you are in days how many weeks till your 50th birthday or how many shopping days until Christmas. Date Calculator is one those little utilities you only need once in a blue moon but they are nice to have.