if ( sscanf(CS end_string, "%u.%u.%u", &end_h, &end_m, &end_s) == 0
|| sscanf(CS s, "%u.%u.%u", &start_h, &start_m, &start_s) == 0
)
if ( sscanf(CS end_string, "%u.%u.%u", &end_h, &end_m, &end_s) == 0
|| sscanf(CS s, "%u.%u.%u", &start_h, &start_m, &start_s) == 0
)