RE: Duration Calculation - slightly improved

From: Don Yantzi

Improved in that it's 4 less lines of code :)

GregorianCalendar date1 = new GregorianCalendar(2008, 01, 15, 0, 0);
GregorianCalendar date2 = new GregorianCalendar(2008, 01, 21, 23, 59);

long diff = Math.abs(date2.getTimeInMillis() - date1.getTimeInMillis());
diff = diff / (1000 * 60 * 60 * 24);

System.out.println(diff);

And the concern here is that the same number of milliseconds might actually
represent different numbers of "days", depending on what you're trying to
determine.

For example, the number of seconds between 8AM on Tuesday and 8PM on
Wednesday is exactly the same as the number of seconds from 8PM on Wednesday
to 8AM on Friday. However, depending on how your scheduling algorithm
works, I could easily envision a situation where the former is treated as
one day, while the latter must be treated as two.

Joe