Re: NSDate without time portion
Re: NSDate without time portion
- Subject: Re: NSDate without time portion
- From: Chris Ridd <email@hidden>
- Date: Tue, 05 Jan 2010 19:23:59 +0000
On 4 Jan 2010, at 13:50, Quincey Morris wrote:
> On Jan 4, 2010, at 02:26, Brian Bruinewoud wrote:
>
>> What's the best way to get an NSDate object for 'today' such that the time is 00:00:00 (or any other constant).
>> I not interested in the time, I only care about the year-month-day, but I do need the the hours-minutes-seconds to be the same on all dates so that I can compare the dates.
>>
>> Currently I do this:
>>
>> NSDateFormatter *dateFmter = [[NSDateFormatter alloc] init];
>> [dateFmter setTimeStyle:NSDateFormatterNoStyle];
>> [dateFmter setDateStyle:NSDateFormatterMediumStyle];
>>
>> NSString dateText = [ dateFmter stringFromDate: self.now ]; // !! !! I need dateText anyway
>>
>> self.now = [ dateFmter dateFromString: dateText ]; // !! truncate time to 00:00:00
>>
>> But this seems ugly, cumbersome and inefficient.
>>
>> The other option might be to use NSDate, NSCalendar and NSDateComponents, but that seems to be even more ugly and cumbersome and probably more inefficient.
>
> NSDate is *not* a good choice for these sorts of comparisons, because it's always a date and a time, and it's not as simple as it seems. Consider this (unlikely) example:
However Core Data models "dates" using NSDate. If you needed to model dates without times in Core Data (and be able to sort/filter on them) what would you do?
Cheers,
Chris
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