NSTimeInterval Usage

Question

I have the following code:

NSNumber *rowValue = [movieDescription objectAtIndex:film];
NSLog(@"ROWVALUE %@",rowValue);


NSUInteger converted = rowValue;
NSLog(@"UNIX %@",converted);


NSDate *date = [NSDate dateWithTimeIntervalSince1970:converted];
NSLog(@"TODAYS DATE %@",date);

This is outputing to the debugger console:

2011-03-24 14:55:37.330 ViRe[27540:307] ROWVALUE 1300906517
2011-03-24 14:55:37.332 ViRe[27540:307] UNIX 1300906517
2011-03-24 14:55:37.338 ViRe[27540:307] TODAYS DATE 1970-01-29 00:12:00 +0000

Clearly this is wrong but I can't see how/why?

Any advice? Thanks