Android_verify/third_party/android-libs/share/man/man3/OPENSSL_gmtime.3ossl

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.\" ========================================================================
.\"
.IX Title "OPENSSL_GMTIME 3ossl"
.TH OPENSSL_GMTIME 3ossl "2024-09-03" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OPENSSL_gmtime,
OPENSSL_gmtime_adj,
OPENSSL_gmtime_diff \- platform\-agnostic OpenSSL time routines
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/crypto.h>
\&
\& struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result);
\& int OPENSSL_gmtime_adj(struct tm *tm, int offset_day, long offset_sec);
\& int OPENSSL_gmtime_diff(int *pday, int *psec,
\&                        const struct tm *from, const struct tm *to);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBOPENSSL_gmtime()\fR returns the \s-1UTC\s0 time specified by \fItimer\fR into the provided
\&\fIresult\fR argument.
.PP
\&\fBOPENSSL_gmtime_adj()\fR adds the offsets in \fIoffset_day\fR and \fIoffset_sec\fR to \fItm\fR.
.PP
\&\fBOPENSSL_gmtime_diff()\fR calculates the difference between \fIfrom\fR and \fIto\fR.
.SH "NOTES"
.IX Header "NOTES"
It is an error to call \fBOPENSSL_gmtime()\fR with \fIresult\fR equal to \s-1NULL.\s0 The
contents of the time_t given by \fItimer\fR are stored into the \fIresult\fR. Calling
with \fItimer\fR equal to \s-1NULL\s0 means use the current time.
.PP
\&\fBOPENSSL_gmtime_adj()\fR converts \fItm\fR into a days and seconds value, adds the
offsets, then converts back into a \fIstruct tm\fR specified by \fItm\fR. Leap seconds
are not considered.
.PP
\&\fBOPENSSL_gmtime_diff()\fR calculates the difference between the two \fIstruct tm\fR
structures \fIfrom\fR and \fIto\fR. The difference in days is placed into \fI*pday\fR,
the remaining seconds are placed to \fI*psec\fR. The value in \fI*psec\fR will be less
than the number of seconds per day (3600). Leap seconds are not considered.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOPENSSL_gmtime()\fR returns \s-1NULL\s0 on error, or \fIresult\fR on success.
.PP
\&\fBOPENSSL_gmtime_adj()\fR and \fBOPENSSL_gmtime_diff()\fR return 0 on error, and 1 on success.
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBOPENSSL_gmtime()\fR, \fBOPENSSL_gmtime_adj()\fR and \fBOPENSSL_gmtime_diff()\fR have been
in OpenSSL since 1.0.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.