Hi Gareth,
When you convert to a DateMidnight, you add in a timezone - the defaault
for your box. If your test crosses a DST boundary, then the length of a
day may be 23 or 25 hours. Also, when converting to a DateMidnight, the
date may not actually have a time at midnight (due to DST rules).
All these factors combine to mean that the comparison differs for
DateMidnight and LocalDate. The exception is if you setup the
DateMidnight with the UTC timezone - then you will get the same result.
Stephen
[EMAIL PROTECTED] wrote:
> I have been looking into joda time and am finding it considerably easier
> to work with than Date, Calendar, etc.
>
> However, I have come across the following issue with the latest release
> version. I've searched the mailing list but can't see any mention of
> it.
>
> Is the following inconsistency a bug or a feature?
>
> Code:
> LocalDate today = new LocalDate();
> LocalDate futureDay = today.plusDays(5);
>
> // Method 1:
> Days days1 = Days.daysBetween(today,futureDay);
>
> // Method 2:
> DateMidnight dmToday = today.toDateMidnight();
> DateMidnight dmFutureDay = futureDay.toDateMidnight();
> Days days2 = Days.daysBetween(dmToday,dmFutureDay);
>
> // Method 3:
> Period period = new Period(today, futureDay);
>
> System.out.println("Method 1 = " + days1.getDays() + " days.");
> System.out.println("Method 2 = " + days2.getDays() + " days.");
> System.out.println("Method 3 = " + period.getDays() + " days.");
>
> Output:
>
> Method 1 = 4 days.
> Method 2 = 5 days.
> Method 3 = 5 days.
>
> The first method is the most intuitive and the one I would like to use,
> however when calculating the number of days from today until a certain
> date, it gives the incorrect answer (I appreciate "days between" is open
> to interpretation, although method 2 uses the same method). 2 and 3
> both give the desired result.
>
> Based on the following quote I would expect methods 1 and 2 to give the
> same results:
>
>> ** Stephen Colebourne <[EMAIL PROTECTED]> wrote **
>>
>>
>> Replying quickly...
>>
>> A LocalDate and a DateMidnight in UTC ought to be effectively
> identical,
>> as they are internally.
>
> The same seems to happen for finding years between two dates as well as
> days.
>
> Many thanks,
>
> Gareth
>
>
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