c2i
if ((uint8_t)c2i(s[i]) > 9)
ts.tm_year = 1000 * c2i(s[0]) + 100 * c2i(s[1]) + 10 * c2i(s[2]) +
c2i(s[3]) - 1900;
ts.tm_mon = 10 * c2i(s[4]) + c2i(s[5]) - 1;
ts.tm_mday = 10 * c2i(s[6]) + c2i(s[7]);
ts.tm_hour = 10 * c2i(s[8]) + c2i(s[9]);
ts.tm_min = 10 * c2i(s[10]) + c2i(s[11]);
ts.tm_sec = 10 * c2i(s[12]) + c2i(s[13]);