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doc/man3/ASN1_TIME_set.pod
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@@ -61,113 +61,115 @@ ASN1_TIME_to_generalizedtime - ASN.1 Time functions
=head1 DESCRIPTION
The ASN1_TIME_set(), ASN1_UTCTIME_set() and ASN1_GENERALIZEDTIME_set()
functions set the structure B<s> to the time represented by the time_t
value B<t>. If B<s> is NULL a new time structure is allocated and returned.
functions set the structure I<s> to the time represented by the time_t
value I<t>. If I<s> is NULL a new time structure is allocated and returned.
The ASN1_TIME_adj(), ASN1_UTCTIME_adj() and ASN1_GENERALIZEDTIME_adj()
functions set the time structure B<s> to the time represented
by the time B<offset_day> and B<offset_sec> after the time_t value B<t>.
The values of B<offset_day> or B<offset_sec> can be negative to set a
time before B<t>. The B<offset_sec> value can also exceed the number of
seconds in a day. If B<s> is NULL a new structure is allocated
functions set the time structure I<s> to the time represented
by the time I<offset_day> and I<offset_sec> after the time_t value I<t>.
The values of I<offset_day> or I<offset_sec> can be negative to set a
time before I<t>. The I<offset_sec> value can also exceed the number of
seconds in a day. If I<s> is NULL a new structure is allocated
and returned.
The ASN1_TIME_set_string(), ASN1_UTCTIME_set_string() and
ASN1_GENERALIZEDTIME_set_string() functions set the time structure B<s>
to the time represented by string B<str> which must be in appropriate ASN.1
time format (for example YYMMDDHHMMSSZ or YYYYMMDDHHMMSSZ). If B<s> is NULL
this function performs a format check on B<str> only. The string B<str>
is copied into B<s>.
ASN1_GENERALIZEDTIME_set_string() functions set the time structure I<s>
to the time represented by string I<str> which must be in appropriate ASN.1
time format (for example YYMMDDHHMMSSZ or YYYYMMDDHHMMSSZ). If I<s> is NULL
this function performs a format check on I<str> only. The string I<str>
is copied into I<s>.
ASN1_TIME_set_string_X509() sets ASN1_TIME structure B<s> to the time
represented by string B<str> which must be in appropriate time format
ASN1_TIME_set_string_X509() sets B<ASN1_TIME> structure I<s> to the time
represented by string I<str> which must be in appropriate time format
that RFC 5280 requires, which means it only allows YYMMDDHHMMSSZ and
YYYYMMDDHHMMSSZ (leap second is rejected), all other ASN.1 time format
are not allowed. If B<s> is NULL this function performs a format check
on B<str> only.
are not allowed. If I<s> is NULL this function performs a format check
on I<str> only.
The ASN1_TIME_normalize() function converts an ASN1_GENERALIZEDTIME or
ASN1_UTCTIME into a time value that can be used in a certificate. It
The ASN1_TIME_normalize() function converts an B<ASN1_GENERALIZEDTIME> or
B<ASN1_UTCTIME> into a time value that can be used in a certificate. It
should be used after the ASN1_TIME_set_string() functions and before
ASN1_TIME_print() functions to get consistent (i.e. GMT) results.
The ASN1_TIME_check(), ASN1_UTCTIME_check() and ASN1_GENERALIZEDTIME_check()
functions check the syntax of the time structure B<s>.
functions check the syntax of the time structure I<s>.
The ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
functions print the time structure B<s> to BIO B<b> in human readable
functions print the time structure I<s> to BIO I<b> in human readable
format. It will be of the format MMM DD HH:MM:SS YYYY [GMT], for example
"Feb 3 00:55:52 2015 GMT" it does not include a newline. If the time
structure has invalid format it prints out "Bad time value" and returns
an error. The output for generalized time may include a fractional part
following the second.
ASN1_TIME_to_tm() converts the time B<s> to the standard B<tm> structure.
If B<s> is NULL, then the current time is converted. The output time is GMT.
The B<tm_sec>, B<tm_min>, B<tm_hour>, B<tm_mday>, B<tm_wday>, B<tm_yday>,
B<tm_mon> and B<tm_year> fields of B<tm> structure are set to proper values,
whereas all other fields are set to 0. If B<tm> is NULL this function performs
a format check on B<s> only. If B<s> is in Generalized format with fractional
ASN1_TIME_to_tm() converts the time I<s> to the standard I<tm> structure.
If I<s> is NULL, then the current time is converted. The output time is GMT.
The I<tm_sec>, I<tm_min>, I<tm_hour>, I<tm_mday>, I<tm_wday>, I<tm_yday>,
I<tm_mon> and I<tm_year> fields of I<tm> structure are set to proper values,
whereas all other fields are set to 0. If I<tm> is NULL this function performs
a format check on I<s> only. If I<s> is in Generalized format with fractional
seconds, e.g. YYYYMMDDHHMMSS.SSSZ, the fractional seconds will be lost while
converting B<s> to B<tm> structure.
converting I<s> to I<tm> structure.
ASN1_TIME_diff() sets B<*pday> and B<*psec> to the time difference between
B<from> and B<to>. If B<to> represents a time later than B<from> then
one or both (depending on the time difference) of B<*pday> and B<*psec>
will be positive. If B<to> represents a time earlier than B<from> then
one or both of B<*pday> and B<*psec> will be negative. If B<to> and B<from>
represent the same time then B<*pday> and B<*psec> will both be zero.
If both B<*pday> and B<*psec> are non-zero they will always have the same
sign. The value of B<*psec> will always be less than the number of seconds
in a day. If B<from> or B<to> is NULL the current time is used.
ASN1_TIME_diff() sets I<*pday> and I<*psec> to the time difference between
I<from> and I<to>. If I<to> represents a time later than I<from> then
one or both (depending on the time difference) of I<*pday> and I<*psec>
will be positive. If I<to> represents a time earlier than I<from> then
one or both of I<*pday> and I<*psec> will be negative. If I<to> and I<from>
represent the same time then I<*pday> and I<*psec> will both be zero.
If both I<*pday> and I<*psec> are nonzero they will always have the same
sign. The value of I<*psec> will always be less than the number of seconds
in a day. If I<from> or I<to> is NULL the current time is used.
The ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() functions compare
the two times represented by the time structure B<s> and the time_t B<t>.
the two times represented by the time structure I<s> and the time_t I<t>.
The ASN1_TIME_compare() function compares the two times represented by the
time structures B<a> and B<b>.
time structures I<a> and I<b>.
The ASN1_TIME_to_generalizedtime() function converts an ASN1_TIME to an
ASN1_GENERALIZEDTIME, regardless of year. If either B<out> or
B<*out> are NULL, then a new object is allocated and must be freed after use.
The ASN1_TIME_to_generalizedtime() function converts an B<ASN1_TIME> to an
B<ASN1_GENERALIZEDTIME>, regardless of year. If either I<out> or
I<*out> are NULL, then a new object is allocated and must be freed after use.
=head1 NOTES
The ASN1_TIME structure corresponds to the ASN.1 structure B<Time>
The B<ASN1_TIME> structure corresponds to the ASN.1 structure B<Time>
defined in RFC5280 et al. The time setting functions obey the rules outlined
in RFC5280: if the date can be represented by UTCTime it is used, else
GeneralizedTime is used.
The ASN1_TIME, ASN1_UTCTIME and ASN1_GENERALIZEDTIME structures are represented
as an ASN1_STRING internally and can be freed up using ASN1_STRING_free().
The B<ASN1_TIME>, B<ASN1_UTCTIME> and B<ASN1_GENERALIZEDTIME> structures are
represented as an B<ASN1_STRING> internally and can be freed up using
ASN1_STRING_free().
The ASN1_TIME structure can represent years from 0000 to 9999 but no attempt
The B<ASN1_TIME> structure can represent years from 0000 to 9999 but no attempt
is made to correct ancient calendar changes (for example from Julian to
Gregorian calendars).
ASN1_UTCTIME is limited to a year range of 1950 through 2049.
B<ASN1_UTCTIME> is limited to a year range of 1950 through 2049.
Some applications add offset times directly to a time_t value and pass the
results to ASN1_TIME_set() (or equivalent). This can cause problems as the
time_t value can overflow on some systems resulting in unexpected results.
New applications should use ASN1_TIME_adj() instead and pass the offset value
in the B<offset_sec> and B<offset_day> parameters instead of directly
in the I<offset_sec> and I<offset_day> parameters instead of directly
manipulating a time_t value.
ASN1_TIME_adj() may change the type from ASN1_GENERALIZEDTIME to ASN1_UTCTIME,
or vice versa, based on the resulting year. The ASN1_GENERALIZEDTIME_adj() and
ASN1_UTCTIME_adj() functions will not modify the type of the return structure.
ASN1_TIME_adj() may change the type from B<ASN1_GENERALIZEDTIME> to
B<ASN1_UTCTIME>, or vice versa, based on the resulting year.
ASN1_GENERALIZEDTIME_adj() and ASN1_UTCTIME_adj() will not modify the type
of the return structure.
It is recommended that functions starting with ASN1_TIME be used instead of
those starting with ASN1_UTCTIME or ASN1_GENERALIZEDTIME. The functions
starting with ASN1_UTCTIME and ASN1_GENERALIZEDTIME act only on that specific
time format. The functions starting with ASN1_TIME will operate on either
format.
It is recommended that functions starting with B<ASN1_TIME> be used instead of
those starting with B<ASN1_UTCTIME> or B<ASN1_GENERALIZEDTIME>. The functions
starting with B<ASN1_UTCTIME> and B<ASN1_GENERALIZEDTIME> act only on that
specific time format. The functions starting with B<ASN1_TIME> will operate on
either format.
=head1 BUGS
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
do not print out the time zone: it either prints out "GMT" or nothing. But all
do not print out the timezone: it either prints out "GMT" or nothing. But all
certificates complying with RFC5280 et al use GMT anyway.
Use the ASN1_TIME_normalize() function to normalize the time value before
@@ -175,21 +177,22 @@ printing to get GMT results.
=head1 RETURN VALUES
ASN1_TIME_set(), ASN1_UTCTIME_set(), ASN1_GENERALIZEDTIME_set(), ASN1_TIME_adj(),
ASN1_UTCTIME_adj and ASN1_GENERALIZEDTIME_set return a pointer to a time structure
or NULL if an error occurred.
ASN1_TIME_set(), ASN1_UTCTIME_set(), ASN1_GENERALIZEDTIME_set(),
ASN1_TIME_adj(), ASN1_UTCTIME_adj() and ASN1_GENERALIZEDTIME_set() return
a pointer to a time structure or NULL if an error occurred.
ASN1_TIME_set_string(), ASN1_UTCTIME_set_string(), ASN1_GENERALIZEDTIME_set_string()
ASN1_TIME_set_string_X509() return 1 if the time value is successfully set and 0 otherwise.
ASN1_TIME_set_string(), ASN1_UTCTIME_set_string(),
ASN1_GENERALIZEDTIME_set_string() and ASN1_TIME_set_string_X509() return
1 if the time value is successfully set and 0 otherwise.
ASN1_TIME_normalize() returns 1 on success, and 0 on error.
ASN1_TIME_check(), ASN1_UTCTIME_check and ASN1_GENERALIZEDTIME_check() return 1
if the structure is syntactically correct and 0 otherwise.
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print() return 1
if the time is successfully printed out and 0 if an error occurred (I/O error or
invalid time format).
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print() return
1 if the time is successfully printed out and 0 if an error occurred (I/O error
or invalid time format).
ASN1_TIME_to_tm() returns 1 if the time is successfully parsed and 0 if an
error occurred (invalid time format).
@@ -197,14 +200,15 @@ error occurred (invalid time format).
ASN1_TIME_diff() returns 1 for success and 0 for failure. It can fail if the
passed-in time structure has invalid syntax, for example.
ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() return -1 if B<s> is
before B<t>, 0 if B<s> equals B<t>, or 1 if B<s> is after B<t>. -2 is returned
ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() return -1 if I<s> is
before I<t>, 0 if I<s> equals I<t>, or 1 if I<s> is after I<t>. -2 is returned
on error.
ASN1_TIME_compare() returns -1 if B<a> is before B<b>, 0 if B<a> equals B<b>, or 1 if B<a> is after B<b>. -2 is returned on error.
ASN1_TIME_compare() returns -1 if I<a> is before I<b>, 0 if I<a> equals I<b>,
or 1 if I<a> is after I<b>. -2 is returned on error.
ASN1_TIME_to_generalizedtime() returns a pointer to
the appropriate time structure on success or NULL if an error occurred.
ASN1_TIME_to_generalizedtime() returns a pointer to the appropriate time
structure on success or NULL if an error occurred.
=head1 EXAMPLES