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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