Suggest BRM inbuilt function to compute future epoch date that could be computed n days from today.
You can use function fm_utils_add_n_days
n specifies the number of days to add to the billing cycle end date. The value can be any positive integer.
&due_t is a pointer to the end date of the current billing cycle (PIN_FLD_ACTG_LAST_T in the /billinfo object). n is added to this date.
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