C BSFN Add 15 Days to Date in C

Hello All,

I am aware of basic C for JDE, so asking following question. I want to add 15 days to a variable in C. I am trying to use MathAdd as "MathAdd(&lpDS->jdAgingDate, &lpDS->jdAgingDate, 15); but it gives
warning C4133: 'function' : incompatible types - from 'JDEDATE *' to 'MATH_NUMERIC

Any alternative C code API or function to use. Thanks for help.

Thanks & Best Regards,
CKL.