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Re: NSDateComponents question
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Re: NSDateComponents question


  • Subject: Re: NSDateComponents question
  • From: Jason Wiggins <email@hidden>
  • Date: Wed, 2 Jul 2008 11:48:06 +1000

For the sake of completeness, the second line was incorrect (bracket preceding NSCalendar). It has been corrected in the following snippet:

On 02/07/2008, at 10:41 AM, mmalc crawford wrote:

NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];


// Get the weekday component of the current date
NSDateComponents *weekdayComponents = [gregorian components:NSWeekdayCalendarUnit fromDate:today];
/*
Create a date components to represent the number of days to subtract from the current date.
The weekday value for Sunday in the Gregorian calendar is 1, so subtract 1 from the number
of days to subtract from the date in question. (If today's Sunday, subtract 0 days.)
*/
NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
[componentsToSubtract setDay: - ([weekdayComponents weekday] - 1)];


NSDate *beginningOfWeek = [gregorian dateByAddingComponents:componentsToSubtract toDate:today options:0];

/*
Optional step:
beginningOfWeek now has the same hour, minute, and second as the original date (today).
To normalize to midnight, extract the year, month, and day components and create a new date from those components.
*/
NSDateComponents *components = [gregorian components: (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
fromDate: beginningOfWeek];
beginningOfWeek = [gregorian dateFromComponents: components];


JJ
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References: 
 >Re: NSDateComponents question (From: Jason Wiggins <email@hidden>)
 >Re: NSDateComponents question (From: mmalc crawford <email@hidden>)
 >Re: NSDateComponents question (From: Christopher Kane <email@hidden>)
 >Re: NSDateComponents question (From: mmalc crawford <email@hidden>)
 >Re: NSDateComponents question (From: Chris Kane <email@hidden>)
 >Re: NSDateComponents question (From: mmalc crawford <email@hidden>)
 >Re: NSDateComponents question (From: Jason Wiggins <email@hidden>)
 >Re: NSDateComponents question (From: mmalc crawford <email@hidden>)

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