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PO
 

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    <p>I have a few nifty methods on NSDate. This is self-explanatory:</p> <pre><code>-(BOOL)isOnTheSameDayAsDate:(NSDate *)date { NSCalendar *cal = [NSCalendar currentCalendar]; NSDateComponents *selfComponents = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:self]; NSDateComponents *dateComponents = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:date]; return (([selfComponents day] == [dateComponents day]) &amp;&amp; ([selfComponents month] == [dateComponents month]) &amp;&amp; ([selfComponents year] == [dateComponents year])); } </code></pre> <p>Usage: </p> <pre><code>if ([aDate isOnTheSameDayAsDate:anotherDate]) { ... } </code></pre> <p>This provides a method to easily get dates like "9am the day before": </p> <pre><code>-(NSDate *)dateWithDayDelta:(NSInteger)daysBeforeOrAfter atHour:(NSUInteger)hour minute:(NSUInteger)minute second:(NSUInteger)second { NSDate *date = [self addTimeInterval:(24 * 60 * 60) * daysBeforeOrAfter]; NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *comps = [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:date]; [comps setHour:hour]; [comps setMinute:minute]; [comps setSecond:second]; return [calendar dateFromComponents:comps]; } </code></pre> <p>Usage: </p> <pre><code>// We want 9am yesterday NSDate *nineAmYesterday = [[NSDate date] dateWithDayDelta:-1 atHour:9 minute:0 second:0]; </code></pre>
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    1. POWhat kind of category methods do you use to make Cocoa programming easier?
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    1. USiKenndac
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    1. COGood stuff. I just started working with `NSCalendar` yesterday, so this is perfect!
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      1. USe.James
 

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