Joda-Time持续时间，以精确的十进制天为单位

Question

I'm trying to use Joda-Time's duration class to calculate the exact days different between two days. Meaning I would like the result to be something like 25.48 days rather than just 25 days. Right now I have:

private static final double MILLISECONDS_IN_DAY = 86400000;

DateTime today = new DateTime();
Duration dur = new Duration(foo.getExpirationDate(), today);
double diff_days = dur.getMillis()/MILLISECONDS_IN_DAY;

But I'm wondering if there's a way to combine the 1st and last line into one that just gives me a double.

Answer 1

You could eliminate the first line by using Joda-Time's constant instead of declaring your own.

org.joda.time.DateTimeConstants.MILLIS_PER_DAY

Don't forget that if you're trying to calculate another date, there may be a better way to do this. The irregularities in calendars such as leap years are well accounted for within Joda-Time.