Checks if a string is a date in the form "yyyyMMdd"
int is_str_date(LPCSTR lpcsz)
[input] lpcsz, string
Integer returns non-zero if string is in expected form: "yyyyMMdd"
EX1
void isdate(string str = "19860302") { int nn = is_str_date(str); out_int("result ", nn); }
origin.h