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I'm attempting to get around a date validation that refuses to take anything earlier than tomorrow. So far I have this: NSDate *dateY = [NSDate dateWithTimeIntervalSinceNow:-86400]; // Negative one day, in seconds (-60*60*24) NSLog(@"%@", [NSDate date]); // "yyyy-MM-dd HH:mm:ss Z", accurate assuming Z = +0000 NSLog(@"%@", dateY); // "yyyy-MM-dd HH:mm:ss Z", same accuracy (minus one day) That's great, but dateY is not an NSNumber . I need an NSNumber for the comparison, but I can't find anything that works. (I don't even know how an NSNumber can be 2011-04-14 13:22:29 +0000 , anyway...) I can use NSDateFormatter to convert an NSDate into an NSString , so if it would be possible to take that string and convert it to the required NSNumber (as opposed to directly converting the NSDate to an NSNumber , which I can't seem to find help with either), that would be fine. - (BOOL)validateDueDate:(id *)ioValue error:(NSError **)outError { NSDate *dateY = [NSDate dateWithTimeIntervalSinceNow:-86400]; NSNumber *tis1970 = [NSNumber numberWithDouble:[dateY timeIntervalSince1970]]; NSLog(@"NSNumber From Date : %@", tis1970); NSLog(@"Date From NSNumber : %@", [NSDate dateWithTimeIntervalSince1970:[tis1970 doubleValue]]); // Due dates in the past are not valid // Enforced that a due date has to be >= today's date if ([*ioValue compare:[NSDate date]] == NSOrderedAscending) { if (outError != NULL) { NSString *errorStr = [[[NSString alloc] initWithString:@"Due date must be today or later."] autorelease]; NSDictionary *userInfoDictionary = [NSDictionary dictionaryWithObject:errorStr forKey:@"ErrorString"]; NSError *error = [[[NSError alloc] initWithDom

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