Re: CalenderUtil Date Math BUG - GWT 2.8 RC2

[Michael Joyner]

  
  
As we are not calling a "set" operation but an "addMonthsToDate"
  operation and as a result we find this behavior surprising - and a
  little non-intuitive.
Calendar does not "skip" a month when using "add" month, the days
  are adjusted to the end of the next month to prevent month
  "skipping".
It does behave as described with a month "skip" if using "set"
  month instead.
See also: http://stackoverflow.com/a/14618664/1341731


On 09/01/2016 09:20 AM, Paul Robinson
  wrote:


  
git tells me CalendarUtil.java is the same in 2.7 and
  2.8RC2. So yes, the code should behave the same.


But the above behaviour is not wrong because it's standard Java
behaviour.


Whether you use Date.setMonth(n) or
  Calendar.set(Calendar.MONTH, n) Java behaves the same way.
  That is, if you start on August 31, and set the month to
  September, then you find you are on October 1.


  
  
On Thu, Sep 1, 2016 at 10:01 AM, Daniel
  Kurka 
  wrote:
  
Does this code do the same thing in 2.7?


  

  On Wed, Aug 31, 2016 at 11:41 PM Paul
Robinson 
wrote:
  

  
  

  
You don't say what part of this you
  think is a bug. I presume it's the fact that Aug
  31 plus one month is Oct 1. If so, this is not a
  bug.
Adding one month should do literally
  that, so you get September 31. But there are only
  30 days in September, so this automatically
  becomes October 1.
Paul

  

  

  

  


  




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Re: CalenderUtil Date Math BUG - GWT 2.8 RC2

[Paul Robinson]

git tells me CalendarUtil.java is the same in 2.7 and 2.8RC2. So yes, the
code should behave the same.

But the above behaviour is not wrong because it's standard Java behaviour.

Whether you use Date.setMonth(n) or Calendar.set(Calendar.MONTH, n) Java
behaves the same way. That is, if you start on August 31, and set the month
to September, then you find you are on October 1.


On Thu, Sep 1, 2016 at 10:01 AM, Daniel Kurka 
wrote:

> Does this code do the same thing in 2.7?
>
> On Wed, Aug 31, 2016 at 11:41 PM Paul Robinson  wrote:
>
>> You don't say what part of this you think is a bug. I presume it's the
>> fact that Aug 31 plus one month is Oct 1. If so, this is not a bug.
>>
>> Adding one month should do literally that, so you get September 31. But
>> there are only 30 days in September, so this automatically becomes October
>> 1.
>>
>> Paul
>>
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Re: CalenderUtil Date Math BUG - GWT 2.8 RC2

[Daniel Kurka]

Does this code do the same thing in 2.7?

On Wed, Aug 31, 2016 at 11:41 PM Paul Robinson  wrote:

> You don't say what part of this you think is a bug. I presume it's the
> fact that Aug 31 plus one month is Oct 1. If so, this is not a bug.
>
> Adding one month should do literally that, so you get September 31. But
> there are only 30 days in September, so this automatically becomes October
> 1.
>
> Paul
>
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> "GWT Users" group.
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Re: CalenderUtil Date Math BUG - GWT 2.8 RC2

[Paul Robinson]

You don't say what part of this you think is a bug. I presume it's the fact
that Aug 31 plus one month is Oct 1. If so, this is not a bug.

Adding one month should do literally that, so you get September 31. But
there are only 30 days in September, so this automatically becomes October
1.

Paul

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CalenderUtil Date Math BUG - GWT 2.8 RC2

[Michael Joyner]

  
  
We have run into what looks like a date math bug for today's
  date:
Here is our logged output:

[butter] Wed Aug 31 16:15:15 GMT-400 2016
Tester Date: Wed Aug 31 16:15:15 GMT-400 2016

  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 mth: 8
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 mth: 7
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 q: 7
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 qMth: 7
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 qMth - mth: 1
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Date (now): Wed Aug 31 16:15:15
GMT-400 2016
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Date (addMonthsToDate): Sat Oct 01
16:15:15 GMT-400 2016, 1
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Date:(setToFirstDayOfMonth) Sat Oct 01
00:00:00 GMT-400 2016
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Date(addMonthsToDate+1): Tue Nov 01
00:00:00 GMT-400 2016
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Date(addDaysToDate-1): Mon Oct 31
00:00:00 GMT-400 2016
  


  
[butter] Wed Aug 31
16:15:15 GMT-400 2016 Tester setDateToLastOfQtr: Mon Oct 31
00:00:00 GMT-400 2016
  

[butter] Wed Aug 31 16:15:15 GMT-400 2016 - on
butter module load - 2.8.0-rc2

Here is the code:

    public static void setDateToLastOfQtr(Date date) {
          // Magic Mike's Fist Qtr Fix --> ask him
          int mth =
  Integer.valueOf(DateTimeFormat.getFormat("M").format(date));
          Api.log("mth: "+mth);
          mth--;
          Api.log("mth: "+mth);
          
          int q = mth / 3;
          Api.log("q: "+mth);
          
          int qMth = (q * 3) + 2;
          Api.log("qMth: "+mth);
  
          Api.log("qMth - mth: "+(qMth-mth));
          Api.log("Date (now): "+date);
          CalendarUtil.addMonthsToDate(date, qMth - mth);
          Api.log("Date (addMonthsToDate): "+date+",
  "+(qMth-mth));
          CalendarUtil.setToFirstDayOfMonth(date);
          Api.log("Date:(setToFirstDayOfMonth) "+date);
          CalendarUtil.addMonthsToDate(date, 1);
          Api.log("Date(addMonthsToDate+1): "+date);
          CalendarUtil.addDaysToDate(date, -1);
          Api.log("Date(addDaysToDate-1): "+date);
      }
  
  




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