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diff --git a/doc/man3/X509_cmp_time.pod b/doc/man3/X509_cmp_time.pod
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+++ b/doc/man3/X509_cmp_time.pod
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+=pod
+
+=head1 NAME
+
+X509_cmp_time, X509_cmp_current_time, X509_time_adj, X509_time_adj_ex
+- X509 time functions
+
+=head1 SYNOPSIS
+
+ int X509_cmp_time(const ASN1_TIME *asn1_time, time_t *in_tm);
+ int X509_cmp_current_time(const ASN1_TIME *asn1_time);
+ ASN1_TIME *X509_time_adj(ASN1_TIME *asn1_time, long offset_sec, time_t *in_tm);
+ ASN1_TIME *X509_time_adj_ex(ASN1_TIME *asn1_time, int offset_day, long
+                             offset_sec, time_t *in_tm);
+
+=head1 DESCRIPTION
+
+X509_cmp_time() compares the ASN1_TIME in B<asn1_time> with the time
+in <cmp_time>. X509_cmp_current_time() compares the ASN1_TIME in
+B<asn1_time> with the current time, expressed as time_t. B<asn1_time>
+must satisfy the ASN1_TIME format mandated by RFC 5280, i.e., its
+format must be either YYMMDDHHMMSSZ or YYYYMMDDHHMMSSZ.
+
+X509_time_adj_ex() sets the ASN1_TIME structure B<asn1_time> to the time
+B<offset_day> and B<offset_sec> after B<in_tm>.
+
+X509_time_adj() sets the ASN1_TIME structure B<asn1_time> to the time
+B<offset_sec> after B<in_tm>. This method can only handle second
+offsets up to the capacity of long, so the newer X509_time_adj_ex()
+API should be preferred.
+
+In both methods, if B<asn1_time> is NULL, a new ASN1_TIME structure
+is allocated and returned.
+
+In all methods, if B<in_tm> is NULL, the current time, expressed as
+time_t, is used.
+
+=head1 BUGS
+
+Unlike many standard comparison functions, X509_cmp_time() and
+X509_cmp_current_time() return 0 on error.
+
+=head1 RETURN VALUES
+
+X509_cmp_time() and X509_cmp_current_time() return -1 if B<asn1_time>
+is earlier than, or equal to, B<cmp_time> (resp. current time), and 1
+otherwise. These methods return 0 on error.
+
+X509_time_adj() and X509_time_adj_ex() return a pointer to the updated
+ASN1_TIME structure, and NULL on error.
+
+=head1 COPYRIGHT
+
+Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut