Further investigation: seems like the native getUTCMonth/setUTCMonth have
the same problem but getMonth/setMonth work fine:
var now = new Date();
now.clearTime();
for(i=0 ; i<12; i++) {
console.log(now);
now.setMonth(now.getMonth() + 1);
}
On Tue, May 26, 2009 at 4:18 PM, Eneko Alonso <[email protected]>wrote:
> Ok, I did some research and here is the problem. It seems like it has some
> issues with the daylight time change.
>
> var x = new Date();
> x.set('date', 1).clearTime();
> for (i=0; i<12; i++) {
> console.log(x.increment('month'));
> }
>
> Mon Jun 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> Wed Jul 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> Sat Aug 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> Tue Sep 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> Thu Oct 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> Sun Nov 01 2009 00:00:00 GMT-0700 (PDT) $family=Object
> *Mon Nov 30 2009 23:00:00 GMT-0800 (PST) $family=Object*
> *Wed Dec 30 2009 23:00:00 GMT-0800 (PST) $family=Object*
> *Sat Jan 30 2010 23:00:00 GMT-0800 (PST) $family=Object*
> *Tue Mar 02 2010 23:00:00 GMT-0800 (PST) $family=Object*
> *Sat Apr 03 2010 00:00:00 GMT-0700 (PDT) $family=Object*
> *Mon May 03 2010 00:00:00 GMT-0700 (PDT) $family=Object*
>
>
> In order to fix this issue, since I only care about the date and not the
> time, I set the time to noon, so I always get the 1st of the month as
> expected:
>
> var x = new Date();
> x.set('date', 1).clearTime().set('hours', 12);
> for (i=0; i<12; i++) {
> console.log(x.increment('month'));
> }
>
> Mon Jun 01 2009 12:00:00 GMT-0700 (PDT) $family=Object
> Wed Jul 01 2009 12:00:00 GMT-0700 (PDT) $family=Object
> Sat Aug 01 2009 12:00:00 GMT-0700 (PDT) $family=Object
> Tue Sep 01 2009 12:00:00 GMT-0700 (PDT) $family=Object
> Thu Oct 01 2009 12:00:00 GMT-0700 (PDT) $family=Object
> Sun Nov 01 2009 11:00:00 GMT-0800 (PST) $family=Object
> Tue Dec 01 2009 11:00:00 GMT-0800 (PST) $family=Object
> Fri Jan 01 2010 11:00:00 GMT-0800 (PST) $family=Object
> Mon Feb 01 2010 11:00:00 GMT-0800 (PST) $family=Object
> Mon Mar 01 2010 11:00:00 GMT-0800 (PST) $family=Object
> Thu Apr 01 2010 12:00:00 GMT-0700 (PDT) $family=Object
> Sat May 01 2010 12:00:00 GMT-0700 (PDT) $family=Object
>
>
> I'll take a look at the source code and see if I can figure out a patch for
> this :)
>
>
>
> On Tue, May 26, 2009 at 3:53 PM, Eneko Alonso <[email protected]>wrote:
>
>> I'm using Date.increment('month') from Mootools More 1.2.2.2 and I just
>> found it does not work as I expected.To me, add month means the day wont
>> change. Thus, if you add a month to January 1st 2009, it should return
>> February 1st 2009. But, if you keep adding 1 month at a time you will find
>> something like November 30th 2009.
>>
>> Either there is a bug on the function or is adding 30 days every time,
>> instead of a month.
>>
>> I haven't tested for end dates, but I'll understand these are more
>> complicated.
>>
>>
>> Whatever is the actual method implemented to increment months, it should
>> be better explained on the documentation:
>> http://mootools.net/docs/more/Native/Date
>>
>>
>>
>> Thanks :)
>>
>
>
