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copied!<p>This works great as an <code>NSDate</code> category.</p> <pre><code>/** Returns a new NSDate object with the time set to the indicated hour, * minute, and second. * @param hour The hour to use in the new date. * @param minute The number of minutes to use in the new date. * @param second The number of seconds to use in the new date. */ -(NSDate *) dateWithHour:(NSInteger)hour minute:(NSInteger)minute second:(NSInteger)second { NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *components = [calendar components: NSYearCalendarUnit| NSMonthCalendarUnit| NSDayCalendarUnit fromDate:self]; [components setHour:hour]; [components setMinute:minute]; [components setSecond:second]; NSDate *newDate = [calendar dateFromComponents:components]; return newDate; } </code></pre> <p>With the above category, if you have an existing date you want to change the time on, you do so like this:</p> <p><code>NSDate *newDate = [someDate dateWithHour:10 minute:30 second:00];</code></p> <p>If, however, you are trying to add or subtract hours from an existing date, a category method to do that is also straightforward:</p> <pre><code>/** Returns a new date with the given number of hours added or subtracted. * @param hours The number of hours to add or subtract from the date. */ -(NSDate*)dateByAddingHours:(NSInteger)hours { NSDateComponents *components = [[NSDateComponents alloc] init]; [components setHour:hours]; return [[NSCalendar currentCalendar] dateByAddingComponents:components toDate:self options:0]; } </code></pre>

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