苹果 ios----把NSDate只精确到天

 NSDateFormatter *formatter = [[[NSDateFormatteralloc] init] autorelease];

        [formatter setDateFormat:@"yyyy/MM/dd"];

        NSString *dateStr = [formatterstringFromDate:nowDate1];

        nowDate1 = [formatterdateFromString: dateStr];

        NSLog(@"%@",nowDate1);