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28a5aa0cbd
Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Hugo Landau <hlandau@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19257)
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
=pod
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=head1 NAME
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OPENSSL_gmtime,
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OPENSSL_gmtime_adj,
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OPENSSL_gmtime_diff - platform-agnostic OpenSSL time routines
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result);
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int OPENSSL_gmtime_adj(struct tm *tm, int offset_day, long offset_sec);
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int OPENSSL_gmtime_diff(int *pday, int *psec,
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const struct tm *from, const struct tm *to);
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=head1 DESCRIPTION
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OPENSSL_gmtime() returns the UTC time specified by I<timer> into the provided
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I<result> argument.
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OPENSSL_gmtime_adj() adds the offsets in I<offset_day> and I<offset_sec> to I<tm>.
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OPENSSL_gmtime_diff() calculates the difference between I<from> and I<to>.
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=head1 NOTES
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It is an error to call OPENSSL_gmtime() with I<result> equal to NULL. The
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contents of the time_t given by I<timer> are stored into the I<result>. Calling
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with I<timer> equal to NULL means use the current time.
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OPENSSL_gmtime_adj() converts I<tm> into a days and seconds value, adds the
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offsets, then converts back into a I<struct tm> specified by I<tm>. Leap seconds
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are not considered.
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OPENSSL_gmtime_diff() calculates the difference between the two I<struct tm>
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structures I<from> and I<to>. The difference in days is placed into I<*pday>,
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the remaining seconds are placed to I<*psec>. The value in I<*psec> will be less
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than the number of seconds per day (3600). Leap seconds are not considered.
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=head1 RETURN VALUES
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OPENSSL_gmtime() returns NULL on error, or I<result> on success.
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OPENSSL_gmtime_adj() and OPENSSL_gmtime_diff() return 0 on error, and 1 on success.
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=head1 HISTORY
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OPENSSL_gmtime(), OPENSSL_gmtime_adj() and OPENSSL_gmtime_diff() have been
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in OpenSSL since 1.0.0.
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=head1 COPYRIGHT
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Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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