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POSetting a desired time for NSDate object fails when adding a week component to it
 

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  1. POSetting a desired time for NSDate object fails when adding a week component to it
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    <p>I'm trying to schedule notifications on every 2 weeks at 12:00 (noon) by looping the following code...</p> <pre><code>unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit; // Allocate new temporary calendar object with default timezone NSCalendar *tmpCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; [tmpCalendar setTimeZone:[NSTimeZone defaultTimeZone]]; // Allocate new temporary date components from the date to fire NSDateComponents *tmpDateComps = [tmpCalendar components:unitFlags fromDate:dateToFire]; // Set time to '12.00' [tmpDateComps setHour:12]; [tmpDateComps setMinute:0]; // Get new date to fire object based on date components dateToFire = [tmpCalendar dateFromComponents:tmpDateComps]; NSLog(@"dateToFire %@", dateToFire); // On 6th iteration = xx-xx-xxxx 09:00 +00:00 // On 11th iteration = xx-xx-xxxx 10:00 +00:00 // Allocate new temporary offset date components NSDateComponents *tmpOffsetComps = [[NSDateComponents alloc] init]; // Add a number of weeks [tmpOffsetComps setWeek:2]; // Get new date to fire object based on offset date components dateToFire = [tmpCalendar dateByAddingComponents:tmpOffsetComps toDate:dateToFire options:0]; NSLog(@"dateToFire %@", dateToFire); //On 6th iteration = xx-xx-xxxx 10:00 +00:00 //On 11th iteration = xx-xx-xxxx 09:00 +00:00 </code></pre> <p>Somehow when I log the <code>dateToFire</code> object inside the loop, on the 6th iteration I first get the correct <code>xx-xx-xxxx 09:00 +00:00</code> but on the second log after I've added the offset components, I get <code>xx-xx-xxxx 10:00 +00:00</code>. The strange thing is that it gets back to correct time inside 11th iteration.</p> <p>What am I doing wrong and how to fix this strange behavior?</p> <p><strong>UPDATE</strong><br> As UIAdam stated, this was happening due to daylight saving so this is a normal behavior.</p>
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    1. USmicadelli
    1. USmicadelli
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    1. COWhat does your unitFlags look like?
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      1. POSetting a desired time for NSDate object fails when adding a week component to it
      1. USUIAdam
    2. CO@UIAdam added initFlags
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      1. POSetting a desired time for NSDate object fails when adding a week component to it
      1. USmicadelli
    3. CODo you have something equivalent to daylight savings/standard time in your location? I'm guessing that is what is adding/subtracting the extra hour. What are the actual dates it is printing when the hour changes?
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      1. POSetting a desired time for NSDate object fails when adding a week component to it
      1. USUIAdam
 

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