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    <p>Using <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDateComponents_Class/Reference/Reference.html" rel="noreferrer"><code>NSDateComponents</code></a> you can extract day/month/year components from the date representing today, ignoring the hour/minutes/seconds components, add one day, and rebuild a date corresponding to tomorrow.</p> <p>So imagine you want to add exactly one day to the current date (including keeping hours/minutes/seconds information the same as the "now" date), you could add a timeInterval of 24*60*60 seconds to "now" using <code>dateWithTimeIntervalSinceNow</code>, but it is better (and DST-proof etc) to do it this way using <code>NSDateComponents</code>:</p> <pre><code>NSDateComponents* deltaComps = [[[NSDateComponents alloc] init] autorelease]; [deltaComps setDay:1]; NSDate* tomorrow = [[NSCalendar currentCalendar] dateByAddingComponents:deltaComps toDate:[NSDate date] options:0]; </code></pre> <p>But <strong>if you want to generate the date corresponding to tomorrow at midnight</strong>, you could instead just retrieve the month/day/year components of the date representing now, <strong>without hours/min/secs part</strong>, and add 1 day, then rebuild a date:</p> <pre><code>// Decompose the date corresponding to "now" into Year+Month+Day components NSUInteger units = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; NSDateComponents *comps = [[NSCalendar currentCalendar] components:units fromDate:[NSDate date]]; // Add one day comps.day = comps.day + 1; // no worries: even if it is the end of the month it will wrap to the next month, see doc // Recompose a new date, without any time information (so this will be at midnight) NSDate *tomorrowMidnight = [[NSCalendar currentCalendar] dateFromComponents:comps]; </code></pre> <p>P.S.: You can read really useful advice and stuff about date concepts in the <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/DatesAndTimes/DatesAndTimes.html#//apple_ref/doc/uid/10000039i" rel="noreferrer">Date and Time Programming Guide</a>, especially <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtCalendars.html#//apple_ref/doc/uid/TP40003470" rel="noreferrer">here about date components</a>.</p>
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