Re: Finding a relative date

FROM : Deborah Goldsmith
DATE : Tue Feb 26 21:39:51 2008

> I did find myself still using NSCalendarDate because I wanted its -
> dayOfYear method. I wasn't worried about localization because my 
> application is used by exactly one user in the middle of a cornfield 
> in SW Michigan. But if someone knows, what is the way to get this 
> with NSCalendar? I found I could use NSCalendar to get all the other 
> useful date pieces (such as -dayOfMonth, -dayOfWeek) I needed except 
> this one. Hmm, I just thought of: computing the first day of the 
> year and get the interval between the first day and the target day? 
> I was blinded to that idea I think by the ease of -dayOfYear!


Use ordinalityOfUnit:inUnit:forDate: which is intended to replace the 
plethora of methods such as -dayOfYear. You should be able to pass 
"day" and "year" as the units.

Deborah Goldsmith
Apple Inc.
<email_removed>

On Feb 26, 2008, at 5:45 AM, Paul Bruneau wrote:

> I am sympathetic to using NSCalendar. At his Boot Camp, Aaron told 
> me that NSCalendarDate was falling out of favor because it's not a 
> good player regarding calendars other than Gregorian. I understand 
> this.
>
> However, the documentation really doesn't provide any direction as 
> to this for a new developer. You might want to file a bug to make 
> the documentation push us new developers in the good direction.
>
> Nowhere in the NSCalendarDate docs does it say "don't use this" or 
> even "try not to use this".
>
> In the very first paragraph of the "Dates and Times Programming 
> Topics for Cocoa" guide, it says:
>
> "A Gregorian date object, a special type of date object, is useful 
> for representing dates users do see. It adds methods for converting 
> dates to strings, converting strings to dates, and retrieving 
> elements from dates (such as hours, minutes, and the day of the 
> week). This is implemented by NSCalendarDate in Objective-C and by 
> com.apple.cocoa.foundation.NSGregorianDate in Java."
>
> ( file:///Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/DatesAndTimes/index.html
> #//apple_ref/doc/uid/10000039i )
>
> Not exactly a warning against its use.
>
> I did find myself still using NSCalendarDate because I wanted its -
> dayOfYear method. I wasn't worried about localization because my 
> application is used by exactly one user in the middle of a cornfield 
> in SW Michigan. But if someone knows, what is the way to get this 
> with NSCalendar? I found I could use NSCalendar to get all the other 
> useful date pieces (such as -dayOfMonth, -dayOfWeek) I needed except 
> this one. Hmm, I just thought of: computing the first day of the 
> year and get the interval between the first day and the target day? 
> I was blinded to that idea I think by the ease of -dayOfYear!
>
> Maybe in addition to battling for localization with all of us, you 
> have to battle with the internal folks too, I don't know. I wish you 
> the best in your battles :)
>
> On Feb 25, 2008, at 6:49 PM, Deborah Goldsmith wrote:
>

>> Please don't use NSCalendarDate, as it only supports the Gregorian 
>> calendar. Please use NSCalendar instead, unless you still need to 
>> run on 10.3.x.
>>
>> Deborah Goldsmith
>> Apple Inc.
>> <email_removed>
>>
>> On Feb 25, 2008, at 11:39 AM, Nir Soffer wrote:
>>

>>>
>>> On Feb 25, 2008, at 21:27, Randall Meadows wrote:
>>>

>>>> Given a specific NSDate, I need to be able to find, say, the 
>>>> Sunday before that date, or the Saturday after that date.  I was 
>>>> hoping to be able to use +dateWithNaturalLanguage with something 
>>>> like "Sunday before [myDate description]", but that just returns 
>>>> myDate.
>>>>
>>>> I know I can brute-force it, by figuring out the myDate's day, 
>>>> then walking backward and/or forward, but is there an easier 
>>>> way?  One more tried and true, less error-prone, that's calendar-
>>>> savvy (not that I'm going to need to go as far back as Oct 
>>>> 1582...)?

>>>
>>> Check NSCalendarDate -dayOfWeek and -
>>> dateByAddingYears:months:days:hours:minutes:seconds:
>>>
>>> Best Regards,
>>>
>>> Nir Soffer

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