diff --git a/crypto/asn1/a_gentm.c b/crypto/asn1/a_gentm.c
index c79c6f538cdccc97f1c5ff3157d4102e6f59e8ba..2f72d4877cd374b76768985570c62d81bbec5757 100644
--- a/crypto/asn1/a_gentm.c
+++ b/crypto/asn1/a_gentm.c
@@ -115,7 +115,7 @@ err:
 
 #endif
 
-int ASN1_GENERALIZEDTIME_check(ASN1_GENERALIZEDTIME *d)
+int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d)
 	{
 	static const int min[9]={ 0, 0, 1, 1, 0, 0, 0, 0, 0};
 	static const int max[9]={99, 99,12,31,23,59,59,12,59};
diff --git a/crypto/asn1/a_time.c b/crypto/asn1/a_time.c
index e2eb9b243efbb17c046b097c50fcf4ae43d94b9c..57bc199376c50196669388b2ff761f1283665cb2 100644
--- a/crypto/asn1/a_time.c
+++ b/crypto/asn1/a_time.c
@@ -125,7 +125,7 @@ ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
 	return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
 	}
 
-int ASN1_TIME_check(ASN1_TIME *t)
+int ASN1_TIME_check(const ASN1_TIME *t)
 	{
 	if (t->type == V_ASN1_GENERALIZEDTIME)
 		return ASN1_GENERALIZEDTIME_check(t);
@@ -196,3 +196,65 @@ int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
 
 	return 1;
 	}
+
+#if 0
+static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *s)
+	{
+	const unsigned char *p;
+
+	if (!ASN1_TIME_check(s))
+		return 0;
+
+	memset(tm, 0 ,sizeof tm);
+	p = s->data;
+
+#define g2(p) (((p)[0] - '0') * 10 + ((p)[1] - '0'))
+	if (s->type == V_ASN1_GENERALIZEDTIME)
+		{
+		int yr = g2(p) * 100 + g2(p + 2);
+		if (yr < 1900)
+			return 0;
+		tm->tm_year = yr - 1900;
+		p += 4;
+		}
+	else
+		{
+		tm->tm_year=g2(p);
+		if(tm->tm_year < 50)
+			tm->tm_year+=100;
+		p += 2;
+		}
+	tm->tm_mon=g2(p)-1;
+	tm->tm_mday=g2(p + 2);
+	tm->tm_hour=g2(p + 4);
+	tm->tm_min=g2(p + 6);
+	p += 8;
+	/* Seconds optional in UTCTime */
+	if (s->type == V_ASN1_GENERALIZEDTIME || (*p >= '0' && *p <= '9'))
+		{
+		tm->tm_sec=g2(p);
+		p += 2;
+		}
+	else
+		tm->tm_sec = 0;
+	if (s->type == V_ASN1_GENERALIZEDTIME)
+		{
+		/* Skip any fractional seconds */
+		if (*p == '.')
+			{
+			p++;
+			while (*p >= '0' && *p <= '9')
+				p++;
+			}
+		}
+	/* Timezone */
+	if(*p != 'Z')
+		{
+		int off_sec = g2(p + 1) * 3600 + g2(p + 3) * 60;
+		if(*p == '-')
+			off_sec = -off_sec;
+		OPENSSL_gmtime_adj(tm, 0, off_sec);
+		}
+	return 1;
+	}
+#endif
diff --git a/crypto/asn1/a_utctm.c b/crypto/asn1/a_utctm.c
index 072e23659233479ce32b756276276638d95466a6..75608df3369d1b85376cb45a4c7e13bdc1ad3c4d 100644
--- a/crypto/asn1/a_utctm.c
+++ b/crypto/asn1/a_utctm.c
@@ -112,7 +112,7 @@ err:
 
 #endif
 
-int ASN1_UTCTIME_check(ASN1_UTCTIME *d)
+int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)
 	{
 	static const int min[8]={ 0, 1, 1, 0, 0, 0, 0, 0};
 	static const int max[8]={99,12,31,23,59,59,12,59};
diff --git a/crypto/asn1/asn1.h b/crypto/asn1/asn1.h
index 45e8fe3159e74a9f85767f44210f31145213dee6..674eec8fe92f05d65e06c61653423d269e325155 100644
--- a/crypto/asn1/asn1.h
+++ b/crypto/asn1/asn1.h
@@ -839,7 +839,7 @@ int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y);
 
 DECLARE_ASN1_FUNCTIONS(ASN1_ENUMERATED)
 
-int ASN1_UTCTIME_check(ASN1_UTCTIME *a);
+int ASN1_UTCTIME_check(const ASN1_UTCTIME *a);
 ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s,time_t t);
 ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
 				int offset_day, long offset_sec);
@@ -849,7 +849,7 @@ int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t);
 time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s);
 #endif
 
-int ASN1_GENERALIZEDTIME_check(ASN1_GENERALIZEDTIME *a);
+int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *a);
 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,time_t t);
 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
 	     time_t t, int offset_day, long offset_sec);
@@ -886,7 +886,7 @@ DECLARE_ASN1_ITEM(ASN1_OCTET_STRING_NDEF)
 ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s,time_t t);
 ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s,time_t t,
 				int offset_day, long offset_sec);
-int ASN1_TIME_check(ASN1_TIME *t);
+int ASN1_TIME_check(const ASN1_TIME *t);
 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZEDTIME **out);
 int ASN1_TIME_set_string(ASN1_TIME *s, const char *str);