ID: 50055
Updated by: [email protected]
Reported By: jennifer dot kimball at nrc dot ca
-Status: Open
+Status: Assigned
Bug Type: Date/time related
Operating System: Solaris 10
PHP Version: 5.3.0
-Assigned To:
+Assigned To: derick
New Comment:
There is a bug here, but the only thing would be that "sub" can *not*
be used with relative time strings such as "last ... of". It is
logically too complicated (for people) to easily reverse strings like
that. Such an attempt should throw an exception/error instead though.
Previous Comments:
------------------------------------------------------------------------
[2009-11-02 15:07:18] jennifer dot kimball at nrc dot ca
Description:
------------
The logical behaviour of a DateInterval created with the "next"
keyword, when subtracted from a DateTime, should be to use "last"
instead of "next" in the calculation (and vice versa).
Instead, it appears that DateIntervals created with "next" or "last"
keywords cannot be subtracted from DateTimes with any accuracy. A
DateTime results from the operation but has an unexpected value.
Reproduce code:
---------------
//positive DateInterval
$da1=date_create();
$ds1=date_create();
$i=DateInterval::createFromDateString('third Tuesday of next month');
echo $da1->format('Y-m-d');
echo date_add($da1,$i)->format('Y-m-d');//works
echo date_sub($ds1,$i)->format('Y-m-d');//fails with weird date
//negative DateInterval
$da2=date_create();
$ds2=date_create();
$i2=DateInterval::createFromDateString('third Tuesday of last month');
echo $da2->format('Y-m-d');
echo date_add($da2,$i2)->format('Y-m-d');//works
echo date_sub($ds2,$i2)->format('Y-m-d');//fails with weird date
Expected result:
----------------
2009-11-02 //today
2009-12-15 //third Tuesday of December
2009-10-20 //third Tuesday of October
2009-11-02 //today
2009-10-20 //third Tuesday of October
2009-12-15 //third Tuesday of December
Actual result:
--------------
2009-11-02 //today
2009-12-15 //third Tuesday of December
2009-09-18 //third Friday of September
2009-11-02 //today
2009-10-20 //third Tuesday of October
2009-11-18 //third Wednesday of November
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=50055&edit=1
