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  1. PO
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    <p>I think I have found a solution. Checking the output carefully, it appears to all come down to the difference in HOURS. For example: comparing today with tomorrow's date might end up being, say, 18 hours away. This results in [difference day] being set at 0 i.e. it thinks tomorrow is today because it is less than 24 hours away. </p> <p>You can see the fix below. I take the number of hours e.g. 18 and divide by 24 (to get the number of days). In this case 18/24 = 0.75. I then round this up i.e. to "1." So while [difference days] thinks tomorrow is today, by rounding up the hours, you know it is in fact tomorrow.</p> <pre><code> -(int) daysTillBirthday: (NSDate*)aDate { // check to see if valid date was passed in //NSLog(@"aDate passed in is %@",aDate); if (aDate == nil) { //NSLog(@"aDate is NULL"); return -1; // return a negative so won't be picked in table } //** HOW MANY DAYS TO BDAY NSDate *birthDay = aDate; // [calendar dateFromComponents:myBirthDay]; NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease]; NSDateComponents *thisYearComponents = [calendar components:NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit fromDate:[NSDate date]]; NSDateComponents *birthDayComponents = [calendar components:NSMonthCalendarUnit|NSDayCalendarUnit fromDate:birthDay]; NSInteger timeNow = [thisYearComponents hour]; [birthDayComponents setYear:[thisYearComponents year]]; [birthDayComponents setHour:timeNow]; NSDate *birthDayThisYear = [calendar dateFromComponents:birthDayComponents]; //NSLog(@"today %@, birthday %@",[NSDate date],birthDayThisYear); NSDateComponents *difference = [calendar components:NSDayCalendarUnit fromDate:[NSDate date] toDate:birthDayThisYear options:0]; NSDateComponents *differenceHours = [calendar components:NSHourCalendarUnit fromDate:[NSDate date] toDate:birthDayThisYear options:0]; double daysFromHours = ((double)[differenceHours hour])/24; // calculate number of days from hours (and round up) int roundedDaysFromHours = ceil(daysFromHours); NSLog(@"daysFromHours %.02f, roundedDaysFromHours %i",daysFromHours,roundedDaysFromHours); if ([difference day] &lt; 0) { // this years birthday is already over. calculate distance to next years birthday [birthDayComponents setYear:[thisYearComponents year]+1]; birthDayThisYear = [calendar dateFromComponents:birthDayComponents]; difference = [calendar components:NSDayCalendarUnit fromDate:[NSDate date] toDate:birthDayThisYear options:0]; } //NSLog(@"%i days until birthday", [difference day]); return (roundedDaysFromHours); [calendar release]; } </code></pre>
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    1. POiPhone: method to calculate days till next birthday not accurate --?
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    1. USJeremy
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      1. VTUpMod
    1. COI just updated the above after finding a better solution for calculating days from today. Hope this helps.
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