计算日期间隔
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];NSDate *date1 = [dateFormatter dateFromString:@"2012-1-1 11:00"]; NSDate *date2 = [dateFormatter dateFromString:@"2012-1-3 12:30"];[dateFormatter release];NSTimeInterval time = [date2 timeIntervalSinceDate:date1];int days = ((int)time) / (3600 * 24); int hours = ((int)time) % (3600 * 24) / 3600;int minutes = (((int)time) % (3600 * 24) % 3600) / 60;NSString *string = [[NSString alloc] initWithFormat:@"%i天%i小时%i分钟", days, hours, minutes];NSLog(@"%@", string);[string release];
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