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POComparing NSDates Without Regard To Time
 

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    <p>Essentially I have a tip of the day feature, with specific tips associated with dates, and I need a way to compare the current <code>NSDate</code> to the saved date for the tip, regardless of time. Obviously the tip for January 1st is relevant at 10AM and 10:30, so I can't literally compare the <code>NSDates</code>. Here are some of the things I've tried:</p> <p><strong>Try 1 - Doesn't work</strong></p> <pre><code>NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:[NSDate date]]; NSInteger day = [components day]; NSInteger month = [components month]; NSInteger year = [components year]; NSDateFormatter *df = [[NSDateFormatter alloc] init]; // [df setDateFormat:@"yyyy-MM-dd hh:mm:ss a"]; [df setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"]; </code></pre> <p><strong>Try 2 - Doesn't work</strong></p> <pre><code>NSString * zoneString = [[NSString stringWithFormat:@"%i-%i-%iT00:00:00", year, month, day] substringFromIndex:([[NSString stringWithFormat:@"%i-%i-%iT00:00:00", year, month, day] length] - 5)]; NSTimeInterval timeInterval = [[zoneString substringToIndex:3] intValue] * 3600; timeInterval += [[zoneString substringFromIndex:3] intValue] * 60; NSDateFormatter * formatter = [[NSDateFormatter alloc] init]; [formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:timeInterval]]; [formatter setDateFormat:@"yyyy'-'MM'-'dd' 'HH':'mm':'ss ZZZ"]; NSLog(@"%@", [formatter stringFromDate:myDate]); </code></pre> <p><strong>Try 3 - Doesn't work</strong></p> <pre><code>NSDate *date = [NSDate date]; [[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit startDate:&amp;date interval:NULL forDate:date]; NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateFormat:@"yyyy-MM-dd"]; if ([[dateFormat stringFromDate:date] isEqualToString:[dateFormat stringFromDate:tipDate]]) </code></pre>
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    1. COSee Gabriele's answer below. I have a similar requirement in an app to check whether an arbitrary event (based on time) occurred on the same calendar date and this is exactly how I do it. Just compare by date components matching year, month and day.
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    2. COI checked that question before posting and the solutions weren't working
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