ASN1_TIME_set
ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t);
ptime = ASN1_TIME_set(NULL, td->t);
at = ASN1_TIME_set(NULL, t);
ASN1_TIME *thisupd = ASN1_TIME_set(NULL, time(NULL));
ASN1_TIME *nextupd = ASN1_TIME_set(NULL, time(NULL) + 200);
ASN1_TIME *at1 = ASN1_TIME_set(NULL, t1); \
ASN1_TIME *at2 = ASN1_TIME_set(NULL, t2); \