JodaTime的Math.max（...）

Question

I have two JodaTime objects and I wanted a method like so

// Return the latest of the two DateTimes
DateTime latest(DateTime a, DateTime b)

But I can't find such a thing. I could easily write it, but I'm sure JodaTime would have it somewhere.

Answer 1

As Jack pointed out, DateTime implements Comparable . If you are using Guava, the maximum of two dates (let's say a and b ) can be determined by the following shorthand:

Ordering.natural().max(a, b);

Answer 2

DateTime implements Comparable so you don't need to roll you own other than doing:

DateTime latest(DateTime a, DateTime b)
{
  return a.compareTo(b) > 0 ? a : b;
}

or by using JodaTime API directly (which takes into account Chronology unlike compareTo ):

DateTime latest(DateTime a, DateTime b)
{
  return a.isAfter(b) ? a : b;
}