int ASN1_UTCTIME_check(ASN1_UTCTIME *d)
	{
	static int min[8]={ 0, 1, 1, 0, 0, 0, 0, 0};
	static int max[8]={99,12,31,23,59,59,12,59};
	char *a;
	int n,i,l,o;

	if (d->type != V_ASN1_UTCTIME) return(0);
	l=d->length;
	a=(char *)d->data;
	o=0;

	if (l < 11) goto err;
	for (i=0; i<6; i++)
		{
		if ((i == 5) && ((a[o] == 'Z') ||
			(a[o] == '+') || (a[o] == '-')))
			{ i++; break; }
		if ((a[o] < '0') || (a[o] > '9')) goto err;
		n= a[o]-'0';
		if (++o > l) goto err;

		if ((a[o] < '0') || (a[o] > '9')) goto err;
		n=(n*10)+ a[o]-'0';
		if (++o > l) goto err;

		if ((n < min[i]) || (n > max[i])) goto err;
		}
	if (a[o] == 'Z')
		o++;
	else if ((a[o] == '+') || (a[o] == '-'))
		{
		o++;
		if (o+4 > l) goto err;
		for (i=6; i<8; i++)
			{
			if ((a[o] < '0') || (a[o] > '9')) goto err;
			n= a[o]-'0';
			o++;
			if ((a[o] < '0') || (a[o] > '9')) goto err;
			n=(n*10)+ a[o]-'0';
			if ((n < min[i]) || (n > max[i])) goto err;
			o++;
			}
		}
	return(o == l);
err:
	return(0);
	}