NSPredicate里面如何添加NSDate进行筛选？

类似于下面这样：日期在十天之内:

NSDate *endDate = [[NSDate date] retain];NSTimeInterval timeInterval= [endDate timeIntervalSinceReferenceDate];timeInterval -=3600*24*10;NSDate *beginDate = [[NSDate dateWithTimeIntervalSinceReferenceDate:timeInterval] retain];//对coredata进行筛选(假设有fetchRequest)NSPredicate *predicate_date =[NSPredicate predicateWithFormat:@"date >= %@ AND date <= %@", beginDate,endDate];[fetchRequest setPredicate:predicate_date];//释放retained的对象[endDate release];[beginDate release];