How to parse a human readable time expression (NSString) into NSTimeInterval?

How to parse a human readable time expression (NSString) into NSTimeInterval?

References

Reference NO 1

http://stackoverflow.com/questions/15187640/how-to-parse-a-human-readable-time-expression-nsstring-into-nstimeinterval

Reference NO 2

http://stackoverflow.com/questions/576110/nstimeinterval-to-readable-nsnumber

Reference NO 3

http://stackoverflow.com/questions/1304677/c-sharp-library-to-parse-human-readable-time-spans

Reference NO 4

http://stackoverflow.com/questions/4005076/what-are-the-parsing-rules-for-expressions-in-c

Reference NO 5

http://stackoverflow.com/questions/15646634/parsing-very-simple-expressions-using-qt

Reference NO 6

https://developer.apple.com/library/mac/documentation/quicktime/reference/QTKitFramework/Miscellaneous/QTKit_Functions/Reference/reference.html

Reference NO 7

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Reference NO 8

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