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Date Calculations

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Does anyone have a book, website, or something else that could help me learn more about date calculations? Specifically adding and subtracting dates to find out time elapsed. For example, I want to take today's date, take a date six months ago and then calculate and display the number of days that has occurred between the two dates.
Any help would be greatly appreciated.
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I'm reluctant to reply to your query because I'm not qualified. But since you've not gotten any bites on your question, I'll offer the very little I know, which is extremely limited.
My books tell of the abstract Calendar class, and of the GregorianCalendar class which is a concrete subclass of Calendar.
Here is a little snippit of code might get you started working with dates. My experience is too limited to give you the solution to your problem, but maybe you can use this as a staring just returns some calendar information:

Maybe someone will finally jump in here who is better qualified to answer your real question.
Good luck!
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