Custom WebiCalc Plugin: Date param of function is not correctly parsed to std:time_t

HI,

We are creating custom functions using WebiCalc Plugin of SAP BOE 4.1 SP04 . We have some custom functions with Date datatype as param. We are unable to typecast it to time_t datatype in C++ library. Do we need to cast the Date data type to some other data type? Can anyone provide us a sample function with Date datatype? Thanks in advance.

Regards,

Swetha