Samson said:

      ch->printf( "%sYour birthday is: %sDay of %s, %d%s day in the Month of %s, in the year %d.\r\n",
                  s2, s1, day_name[ch->pcdata->day % sysdata.daysperweek], day, suf, month_name[ch->pcdata->month], ch->pcdata->year );

This would return this error...

player.cpp:1745: error: request for member daysperweek in sysdata, which is of non-class type system_data*

I believe it should be

      ch->printf( "%sYour birthday is: %sDay of %s, %d%s day in the Month of %s, in the year %d.\r\n",
                  s2, s1, day_name[ch->pcdata->day % sysdata->daysperweek], day, suf, month_name[ch->pcdata->month], ch->pcdata->year );

You are quite correct, let me fix that