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Sub String in Pre-Processor?

Does anyone know how to get the pre-processor to spit out a substring? In this case, I want to include only the year from the __DATE__ macro.
Something like:

#define YEAR=substr(8,4,__DATE__)
const char code ROMSTRING={"COPYRIGHT " YEAR "by such and such company. Compiled on " __DATE__};

where the #define is something the pre-processor can handle.

Thanks

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