NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *path = [[paths objectAtIndex:0] stringByAppendingString:@"/hi.dat"];
[[NSFileManager defaultManager] createFileAtPath:path contents:NULL attributes:NULL];
NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
NSLog(@"URL is: %@", url);
[url release];
NSDate *date = [NSDate dateWithTimeIntervalSinceNow:0.0];
// 打印日期:中间的空格可以用'at'或'T'等字符来分隔
NSDateFormatter *dateFomatter = [[NSDateFormatter alloc] init];
[dateFomatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSLog(@"Current date is: %@", [dateFomatter stringFromDate:date]);
[dateFomatter release];