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Title "OPENSSL_GMTIME 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
OPENSSL_gmtime, OPENSSL_gmtime_adj, OPENSSL_gmtime_diff - platform-agnostic OpenSSL time routines 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 Header "DESCRIPTION" \fBOPENSSL_gmtime() returns the \s-1UTC\s0 time specified by timer into the provided \fIresult argument.

\fBOPENSSL_gmtime_adj() adds the offsets in offset_day and offset_sec to tm.

\fBOPENSSL_gmtime_diff() calculates the difference between from and to.

Header "NOTES" It is an error to call OPENSSL_gmtime() with result equal to \s-1NULL.\s0 The contents of the time_t given by timer are stored into the result. Calling with timer equal to \s-1NULL\s0 means use the current time.

\fBOPENSSL_gmtime_adj() converts tm into a days and seconds value, adds the offsets, then converts back into a struct tm specified by tm. Leap seconds are not considered.

\fBOPENSSL_gmtime_diff() calculates the difference between the two struct tm structures from and to. The difference in days is placed into *pday, the remaining seconds are placed to *psec. The value in *psec will be less than the number of seconds per day (3600). Leap seconds are not considered.

Header "RETURN VALUES" \fBOPENSSL_gmtime() returns \s-1NULL\s0 on error, or result on success.

\fBOPENSSL_gmtime_adj() and OPENSSL_gmtime_diff() return 0 on error, and 1 on success.

Header "HISTORY" \fBOPENSSL_gmtime(), OPENSSL_gmtime_adj() and OPENSSL_gmtime_diff() have been in OpenSSL since 1.0.0. Header "COPYRIGHT" Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.

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>.