//创建日期格式化对象
NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
//创建了两个日期对象
NSDate *date1=[dateFormatter dateFromString:@"2010-3-3 11:00"];
NSDate *date2=[dateFormatter dateFromString:@"2010-3-4 12:00"];
//NSDate *date=[NSDate date];
//NSString *curdate=[dateFormatter stringFromDate:date];
//取两个日期对象的时间间隔:
//这里的NSTimeInterval 并不是对象,是基本型,其实是double类型,是由c定义的:typedef double NSTimeInterval;
NSTimeInterval time=[date2 timeIntervalSinceDate:date1];
int days=((int)time)/(3600*24);
int hours=((int)time)%(3600*24)/3600;
NSString *dateContent=[[NSString alloc] initWithFormat:@"%i天%i小时",days,hours];